The vertical video is shot, edited and captioned. Now you need to decide where it goes. “Post it everywhere” sounds sensible until you check the numbers a month later: 2,000 views and five DMs on Reels, a hundred views on Shorts, 8,000 views on TikTok from people in four countries and not a single order.
None of the three is simply “better.” Reels, Shorts and TikTok accept the same 9:16 file but reward different things: Instagram rewards shares and conversations with people who already know you, YouTube rewards videos people search for, TikTok rewards holding strangers in the first seconds.
Below: a one-table comparison, how to choose your first platform, how to run three feeds without three shoots, and a 30-day test with a clear decision rule.
The short answer: which platform first
- Reels if your customers are local and buy through conversation. Restaurants, salons, clinics, home services, shops delivering across town. Instagram is the only one of the three where “how much?” in DMs is one tap away from the video.
- Shorts if people keep asking you the same questions. Experts, service companies, education, B2B. An answer video gets found through YouTube and Google for months, not just in the first 48 hours.
- TikTok if you need reach among strangers, an audience aged 16–30, or you sell physical products where TikTok Shop is available (the US, the UK and parts of the EU). A new account with zero followers gets a fair shot faster here than anywhere else.
If two bullets fit, start where your buyers already are, not where the views are bigger.
The comparison in one table
| Reels | Shorts | TikTok | |
|---|---|---|---|
| Max length | 3 minutes | 3 minutes | 10 minutes |
| Who sees it first | followers and similar non-followers | Shorts feed and search | For You feed, mostly strangers |
| Video lifespan | 1–3 days | weeks to months | a day to a couple of weeks |
| Search | barely drives traffic | YouTube and Google | in-app, used instead of Google |
| Text | caption up to 2,200 chars, max 5 hashtags | title up to 100 chars | caption up to 4,000 chars |
| Clickable link | profile bio only | not in description; “Related video” link | bio of a business account |
| Direct payouts | invite-only bonuses | YPP: 1,000 subscribers and 10M Shorts views in 90 days | Creator Rewards: 10,000 followers, videos over 1 minute, select countries |
Three things follow from it.
Lifespan sets the pace. Reels needs consistency: a video peaks in two days, then you need the next one. Shorts compounds: video number twenty keeps collecting views while you film number thirty. On TikTok a three-week-old video sometimes takes off out of nowhere.
The link decides where the customer goes. You can’t tap a link under the video on any of the three, so the call to action changes: “DM us the word PRICE,” “full video on the channel,” “link in bio.”
Availability beats the algorithm. TikTok has been banned in India since 2020 and is restricted in several other markets. If your customers can’t open the app, viral views won’t turn into orders. More on that in our guide to TikTok for business.
How each platform decides who sees your video
Reels. A slice of your followers sees it first, then Instagram tests it on non-followers with similar interests. Instagram openly names watch time, likes and sends as the main signals, and sends per reach weigh the most: “sent it to my sister” beats a like. Trial Reels let you test an idea on non-followers only, without it appearing on your grid until you decide.
Shorts. The feed shows a video to small groups and widens distribution while people keep watching. In parallel, the video is indexed like a page: a title such as “how to get rid of washing machine smell” keeps bringing viewers six months later. In Studio, watch two counters: views, which count every play, and engaged views. The gap between them is the price of your first frame. More in our YouTube Shorts strategy.
TikTok. Follower count matters least here. The For You feed is built around each viewer’s interests, so a brand-new account reaches strangers on day one. The flip side: every new video competes from scratch. And search: Gen Z types “best tacos in Austin” straight into TikTok, so keywords in your caption and on-screen text do real work.
Run three platforms without filming three times
Filming separately for each network is the fastest way to quit within a month. What works: one shoot, one clean master file, three packages.
- Export a master with no watermarks. Edit in CapCut, Edits or on desktop and save the file before posting anywhere. A TikTok download with the logo gets pushed down by Instagram and YouTube.
- Keep on-screen text in the safe zone. The bottom and right edge are covered by captions and buttons on all three. Stay 15–20% away from the edges.
- Change the packaging, not the video:
| Reels | Shorts | TikTok | |
|---|---|---|---|
| Text | 1–2 lines plus a DM prompt | title phrased as a search query | keywords in the first 100 characters |
| Audio | Instagram library (limited for business accounts) | original audio or YouTube library | Commercial Music Library for business accounts |
| Cover | a frame that survives the 3:4 grid crop | face plus 2–3 big words | frame with a text hook |
| Call to action | ”DM us PRICE" | "full video on the channel" | "link in bio” |
- Space posts a day or two apart. That way you actually answer comments on each network, not just the first one.
Pull topics from what you already have: a webinar or a question your sales team hears weekly breaks into five to ten clips. The method is in our post on content repurposing.
The 30-day test: decide by your own numbers
Other people’s case studies are bad advice here: a bakery and a law firm get opposite winners. One honest month tells you more than any review.
- 12 videos in 4 weeks, three a week, same idea on all three networks, packaged per the table above.
- One checkpoint: 7 days after posting. First-hour numbers mean nothing.
- Five numbers per platform: views, average percentage watched, follows, profile visits and actions (messages, calls, orders).
- The main metric is actions per 1,000 views. Not views, not followers.
A made-up example: a bakery in Austin after a month of testing.
| Reels | Shorts | TikTok | |
|---|---|---|---|
| Views in the month | 18,000 | 6,500 | 41,000 |
| Messages and orders | 37 | 4 | 3 |
| Per 1,000 views | 2.1 | 0.6 | 0.07 |
TikTok is the loudest, Instagram sells. Reels becomes the main platform: native videos, trends and comment replies go there. Shorts becomes the piggy bank: near-zero-effort copies that start pulling search traffic over time. TikTok stays as a showcase or gets dropped. Then split effort 70/30 between the main platform and the copies, and revisit every quarter.
When short video isn’t your main channel
- You sell through a newsletter or community. The clip is only the entry point. Count sign-ups, not views.
- Complex B2B with a long sales cycle. Videos bring awareness, not leads. Treat them as a brand budget.
- No capacity for three videos a week. One clip every two weeks gets noticed by no feed. Carousels and text posts will do more.
- You need results this week. Organic reach doesn’t work that way on any platform. That’s a job for ads.
Once the main platform is chosen, the routine is getting videos out on time and comparing numbers without three dashboards open. Repost21 publishes Reels to Instagram and Shorts to YouTube on a schedule from one calendar, with analytics for both accounts side by side; TikTok isn’t on the list of supported platforms, so that upload stays manual. Try it free and pick your platform based on your own month of data.