sooo, do an Uair to cover the ledge and land back on the level, l cancel, then do a downward angled Ftilt to interupt the Up b recovery.
OR
do a downward angled ftilt to block the over b, then do an uair (reverse uair) to stop the up b recovery. which one do you suggest.
It really depends on the placement of the space animal. They won't always try to sweetspot the ledge with their over-b, so be ready to jab or grab them out of it if they attempt to hit you with it. But since the space animals' recovery is pretty limited, I would normally suggest using the back-a to fend off either of their recoveries. This is not only because the timing is a lot less of a gamble, but the 14 or so damage doesn't hurt, and there is little to no chance that Ganondorf will be touched by their recovery. Depending on where they try to land the recovery (ledge or stage), just remember the moves that you can use to stop them.
Down Tilt, Forward Tilt, Jab, Dash Attack(not so great as an edge guard, more of an insult than anything, really), Up-Air(reverse or forward), Back Air, Down-B(very difficult unless they hit the ledge too high, but amazing nonetheless), or, of course, the Down-Air(your attack frames extend behind you, so a reverse Down Air can catch an animal attempting to sweetspot).
Just mix it up and see what works for you, but be ready to analyze the situation. Pay attention to height of your opponent, the actions they've taken previously in the game, and don't be afraid to call the over-B almost every time. Since the over-b is so much faster than the up-b, you will always have time to make up for it while their up-b is sitting there before it moves. Just remember that the mindset of a space animal user when they're off the ledge is to get back to stage by any means necessary. This means that if you hit them out of their up-b and the knock back lines them up with the ledge again, be ready for that over-b attempt to sweetspot. Just try not to fall for the same trick twice, the best thing a space animal can while off the stage is mind game you, and your greatest weapon is prediction.