I've had Hawaii, Tuvalu and Tahiti.
My favorite view is from Tuvalu because all you see is water. If you put your head over the railing and look down, you can see a couple feet of tropical bush things, but if you don't, all you see is water.
It isn't nearly as far from the pool/main building as Tahiti, but it is kind of a pain to have to walk down the dock, across the dock and then back up the dock to get to the pool. I wish there was a walkway...but that would defeat the purpose of a dock!
All in all, I'd take Tuvalu over the other two.
Tahiti has a beach out in front with palm tress that obstruct your view. I've seen it when the palm trees needed to be cut and right after they were cut...it is better when they've been cut, but not by a whole lot. They don't just block the view of things in the distance, they also block your view of the Electric Water Pageant - we saw 1/3 to 1/2 of it.
Tahiti is so very close to the Ticket and Transportation Center, though - which is, IMO, a giant plus. And near the elevators, there are small lounge areas with couch, chair and table.
Hawaii's view is decent, but much more public than the others, with people out there all the time. Flip side, it is closer to the pool/main building and is club level, so you get the perks that go with that, if you want them and are willing to pay.
I'm not a fan of club level for my own reasons and won't get into all that here.
Those are the only MK views I've had - I dunno if there are more or what. They all have good / bad points. You make the call!