>>400075564
>best alternative out of the upcoming headsets?
no one knows anything about any of the upcoming headsets. project cambria/meta quest pro pictures got leaked but still very little is known about it so it's impossible to recommend. it's probably going to be expensive though, more-so than the Index. I doubt it will be better than the Index though, especially for VRChat which Index naturally supports full body tracking. Meta/Quest products you have to jump through a few hoops to get it to work.
Your best bet is probably to just get an Index.