>>336379482
3.0 allows you to create custom animations that can affect pretty much anything on your avatar, plus provides a menu system to trigger these. You can also set up custom locomotion (turn off avatar walking for FBT using a menu toggle), AFK animations, and other cool stuff.
2.0 is no longer going to get updates and eventually vrchat may stop supporting uploading 2.0 avatars, but that may be along way off. Beyond that if you are just going to reupload your current avatar there's no point at the moment. Hold off until they do the avatar interaction update which they confirmed will be 3.0 only