Tough decision!!!!! Both are great so either way you won't be dissappointed. I LOVE Zelda so I voted for WW. I have Pikmin 3 and it's amazing too.
WW is a little longer but Pikmin 3 has multiplayer.
You sure about 101? Did you try the demo? I would actually recommend WW and Pikmin 3 rather than 101 (get that later lol).
I tryed the demo and 101 seemed very fun and different. I also want to support Platinum in hopes that Nintendo makes them 1st party.
It's not your job to support games studios and encourage Nintendo to buy P*. If the game doesn't have enough appeal to sell, then your purchase won't change the result. And Nintendo rarely buy established external studios, they aren't likely to buy Platinum, even if they were selling lots of games.