vrchats more popular and older so its got more content to it and its more stable, but its got lots of old design decisions zhat limit what you can do in it to a degree (also it uses easy anticheat which sucks)
resonite is newer, less popular, less performant (shouldnt be a problem for you on your new system zhough) but has a much more built-from-zhe-ground-up design zhat adds a lot more freedom into what you can do in it
on a less impartial note: vrchat has never failed me whereas resonite once spent 15 minutes loading its own loading icon on boot lmao