Zelda is massively better absolutely no question there, ganon...not sure.
Yes he has better frame data on most moves, but he lost a few things that he really needed to truly be better.
His uair no longer covers behind him and below with the semi-spike hitbox, so it’s not as useful as 4, where it was amazing as a gimping tool. It also feels far slower and seems to have less range( I think on range..) than in 4, even though it still auto cancels from shorthop, this also makes it a bit less useful than 4 as a “get off me” tool from out of shield.
He no longer dies second from ganoncides, which hurts the utilty of side b a bit, as once you’re both on last stock, people don’t have a as much reason to fear you near the ledge/while recovering, so they’ll be more willing to try and gimp you offstage.
He no longer auto-snaps to the ledge as easily in 4(course no one really does, but his always seemed to have insane auto-snap range) making his recovery slightly worse(and it’s already awful)
His upsmash isn’t as useful since it lost the iasa frames the kick used to have, which made the kick a actual fake out move.
i also feel the “do anything from a dash” doesn’t help him near as much as other characters, it does help no doubt, but not quite as much, because all his tilts and jab are still roughly the same.
Overall I feel Ganon’s offstage and recovery options are worse, but he got a few new changes that do help him a bit on ground(up tilt is actually a bit more useful now instead of just an insult move thanks to less startup time), but I just feel those don’t help enough to really say with absolute certainty he’s majorly better. His changes to up air especially sting, this move was truly one of the only ones I’d say was amazing in 4, and they neutered it so much
I honestly still feel he’s probably gonna remain low tier.