Use both, for different jobs: a reel shows the product in use and gets you found, and a carousel explains one thing properly and builds trust. The question is not which one, but which one for which post.
Here is a monthly split you can keep, what each format is for, what the choice says about you, and how to check it on your own account.
A split you can keep
At two posts a week you have eight a month. Make one post a week a reel: the product in use, the making, the hands. Make one post a month a carousel that explains one thing properly: the material, the process, the reason behind a price. The other three are single photos of the product.
A bakery's month on that split: four reels of the loaf being shaped, scored, baked and cut; one carousel on why the starter is fed twice a day; three photos of the week's bake. It fits in the diary and it does both jobs.
What a reel is for
A reel puts you in front of people who do not follow you yet. It works when it is precise about one thing: one moment, shown well, in the time you have. Not a list of benefits, and not the whole story.
A candle lighting. A loaf cut open. A glaze coming out of the kiln. A ceramics studio that films ten seconds of that last one has said more about its work than a paragraph could. For which kinds of video to make, borrow from what keeps coming back on TikTok.
What a carousel is for
A carousel is for the considered buy. When someone is thinking about a mattress, a made-to-order ring or a course, they want to read before they decide, and the reading has to exist. Slide by slide, a carousel explains one thing properly.
A jewellery maker posts six slides on how a ring is made to order, from the sketch to the polish. It is the post the maker sends to every customer who asks why it takes three weeks. Written once, it answers for a year. It is also the best place to show what the price pays for.
A reel makes someone stop. A carousel makes them stay.
The format says something about you
Before anyone reads a word, the format has already spoken. Short says: one precise thing, and I respect your time. Long says: this is worth sitting down for, and I know it well. Choose the one that says the true thing about what you sell.
A furniture maker who only posts ten-second clips tells people the pieces are quick to make. The same maker with one carousel a month on how a chair is jointed tells them the truth: it takes weeks, and that is why it lasts.
Check it on your own account
Open Instagram's Insights on your last reel and your last carousel. For the reel, look at how many of the people who saw it do not follow you yet: that is the reel doing its job. For the carousel, look at saves and shares: people keeping it to read again, or sending it to someone who is deciding. Which Instagram numbers matter shows where each one sits.
A skincare shop that checks once a month sees which reels bring new people in and which carousels get saved, and makes more of each.
What CP3® does here
Branded Content drafts in all four formats: posts, carousels, reels and stories. Each idea arrives with its format already chosen, so you see the month's mix on the calendar before you approve it. Every draft comes from the same brand profile, so a reel and a carousel sound like the same brand. CP3® does not make video: for a reel you get the visual direction and the caption direction, and filming the product in use stays with you.