I'm not super familiar with the details of either (as I've gotten so used to the AUR having everything I might want), but I can say with some confidence that snap was rolled out in a way that doesn't do it any favors.

I have an old laptop that I occasionally boot into to do some stuff, but not super often. After an update, it appeared as though Firefox had forgotten everything; I wasn't logged in, default start page, all settings reset, etc. I was super confused and mildly annoyed, but I set everything back up anyways. Then a bit later I ran Firefox again and it opened to what it was before the update??? Then I realized there were two installs, one apt and the other snap, and the latter was installed without my permission (or knowledge, maybe apt said in one of its 10k lines it spits out that 'btw here's a snap package' that I was somehow supposed to notice).

I find containerized packages really nice for things that are very dependant on how the system is setup but are unlikely to get updated if that system changes (either by me not updating it or it just going unmaintained). Firefox is not that though.