Why is there even a harder version? That should've been the default. The first final (oxymoron lol) fight with Bowser is very, very predictable and pretty underwhelming to the point I'd compare it to Galaxy 2's fight.
I mean, he has, like, only four different attacks: throw hats and *bleep* at you, stomp like an idiot with easily-avoided fire rings, breathe fire in a circle. When you approach him, he can tail swipe you. It feels more like an effing Mario Party game, except with even less attacks compared to Mario Party 5's Frightmare. And he can spawn a heart or two if you ever oopsie-daisy.