The question usually arrives as a trend: video is winning, so post more video. There is some truth in it, but it makes a poor rule for a small brand. Followed without a plan, it pulls time towards motion and away from the still images that were already doing good work.
The short answer
Let the content decide. Motion earns its place when there is something to reveal, sequence or compare, because movement shows change better than anything else. A still earns its place when people need time with a detail, a price or a message. Most brands need both, chosen on purpose rather than by habit.
When a still is the better choice
A still is at its best when the value is in the looking. A close-up of a fabric, a glaze or a pour asks people to slow down, and movement would only get in the way. The same goes for anything that has to be read, such as an announcement, opening hours or a price.
Stills also suit places where people browse and save rather than watch, such as Pinterest boards and product pages. A strong single image is easy to return to and easy to recognise later. That is why a good product photo can keep working long after it was first posted.
When motion earns it
Motion is strongest when the story has a before and after. A reveal, a set of angles, a range coming together or a product in use all have a natural start and finish. Showing that change in a few seconds is something a single image can’t do.
The movement has to mean something, though. A detail coming into focus or a collection lining up gives the eye a reason to follow, while movement added only to make a post move rarely does.
A worked example
Take a ceramics brand launching a mug in six glazes. The glaze is the reason to buy, and it only really shows up close, so the detail belongs in a still: one glaze, one image and time to look. The choice of six colours is a different story, and it suits motion. Six mugs lining up one by one says “pick yours” faster than six separate posts.
Same shoot, two formats, each doing the job it does best.
A simple mix to start with
If you post three times a week, start with one piece of motion, one carousel and one single image. The motion catches attention, the carousel explains, and the single image gives the feed a place to rest. Treat it as a starting point rather than a rule, because the right balance depends on your product.
Test it on your own audience
Other brands’ averages say little about yours, so run a small test. Take one strong image and post it twice, a few weeks apart: once as a still, and once with a simple movement such as a slow reveal. Keep the caption and posting time as close as you can. Then compare whatever matters to you, whether that is saves, shares, profile visits or clicks.
Repeat it with two or three images and a pattern usually appears. Some products clearly gain from movement, and others do just as well standing still. Both answers are useful, because they tell you where to spend your production time.
Make both from the same images
The choice gets easier when both versions come from the same set. In 5K you upload your images once and make motion, carousels and banners from them, in the sizes each place needs. That keeps static versus motion an editorial choice rather than a budget one, and it turns a side-by-side test into a few minutes’ work.
Use both, on purpose
The real question is not static or motion. It is what each post has to do: catch the eye, explain a range or let a detail be seen. Match the format to the job, test it on your own audience, and make more from what you already have.