I see “utilize” a lot in technical writing. A lot of folks seem to think that the fancier word, the better. Not so!
Good expository writing is concise, and that often means using the simpler word if you have a choice. Besides, the words aren’t quite the same. “Utilize” implies that something was used “creatively,” made use of, as it were.
The rule: if use works, use it.
Besides, since that’s a poster, “use” takes up less space and is easier for the audience to read. If they can read.