I thought TP's game design was worse than WW's. I liked WW's overwold, and found TP's to be absolutely boring. I loved WW's side quests, and found pretty much all of TP's (aside from the one where you learn new moves and fishing of course) sucky.
I also think WW had a better story. I mean, I don't care for plots in Zelda in general, but WW is the only Zelda with a cohesive story, and Zelda isn't a total wimp either. She's bad ass in WW.
I honestly think the only thing TP has over WW are dungeons. The dungeons are fucking awesome.