From what I've seen, Bowser's experience is definitely the better one. He hasn't changed a bit; he still has the same cocky, arrogant tough-guy attitude, and he's always making a bunch of snide remarks toward other people. Also, Bowser's had more encounters with Fawful than Mario and Luigi have, and just about any scene that includes him is hilarious. I don't know whether or not it's his psychotic grin, or the fact that hardly anything he says makes sense.