If you don't like the simpons, don't buy tspp. One of the great things about the game is theme integration. If you don't get or don't like the Simpsons, you won't fully appreciate the game.
IJ is a wide body so it may feel slower. Lots of modes, it's not an easy game to do really well in if you set it up properly. Great theme integration.
Don't have a lot of time on WOZ or met, but WOZ never clicked with me. It is a beautiful game, though. I'm not a fan of Metallica music and I already have iron man, which is a very similar layout, though obviously different rule set.
My personal choice would be TSPP, but your personal choice may be different. Unless you have a lot of time on all of them, I'd wait to play them all before deciding.
Tspp is the best value game out there right now in terms of depth and what the game offers overall.