I don't think I can pick one to be honest. Breath of the Wild or Tears of the Kingdom would be up there, as would Wario Land 4... but so would Mario Odyssey, DK Bananza and numerous others.
Lol the idea of using Rudy as a Giant Baby Bowser replacement is great.
Would probably look better if his feet weren't visible though, since it'd make him look a lot bigger and more akin to the Yoshi's Island version.
So I was tuning in to a SMBX direct that showcased episodes and mods and one of them in particular had a spectacular variety of bosses ported into the 1.4.5 version of game, in which they included the Baby Bowser fight, so of course I've decided...