Been using Dropbox for 4 years on a Unreal project with a team with pretty much 0 problems. It works great. I revert files all the time. I’v’e messed up my project and was able to fix it via dropbox’s tools.
So I highly recommenced if you are not a large studio, Dropbox works great. I also use perforce at work and it’s a huge pain in the ■■■. Yes it has cool features but we barley use them. Perforce is great if you have a developer who wants to control ALL assets coming into the project.