I have an account on both platforms but don't use either a great deal myself.
At least amongst the people I know (in their 10s and 20s) Instagram seems to be a more popular platform. I think if your content is relating to gaming/Zelda or something that is to be targeted toward young people/middle aged people Instagram is the better focus. However, uploading the same video to both platforms probably would give you better coverage?
There is also a newish app called Tik Tok which has exploded in popularity lately but I feel like I am getting old since I am really out of the loop on that one and don't have an account. I know it is much more suited to very short videos (with a short time limit) though so it is probably not going to work with that kind of content.