Ultimately, it doesn't matter to me because:
1. Smash's gameplay and online infrastructure have both been bad since Brawl
2. Ultimate's sheer volume of content is cool, but I only really enjoyed spirit battles, which was a glorified event mode from Melee but with worse balance
3. Rivals of Aether 2 exists and I've been enjoying it much more than I ever enjoyed Ultimate or 4

I'm also a huge Air Ride fan, so whatever