Elizabeth - of all the character meals (and we've tried just about all of them, I believe), Garden Grill, LTT, and Chef Mickey's are our favorite.
Although I can see where you're coming from in that there are some similarities, they're still very different. If you want to set aside the food, it comes down to ambiance and characters. At LTT you'll get Chip, Dale, Goofy, Pluto, and Minnie. At GG, you'll get Chip, Dale, Pluto and Mickey. If Mickey, Minnie, or Goofy are a deal-breaker for you, go with the one that has them.
Also, at GG, I think it's a bit more "private" - particularly if you can get one of the outer booths. LTT, you're a bit more squished together.
That said, we love both!
Read somewhere, too, that they've moved the dates for Teppanyki's refurb (Allears newsletter, maybe?). I think it might now be through sometime in June, so if you're worried about them reopening by May, you might want to reconsider if they're pushing it back.
Not sure what to tell you after AK, although your thought of taking a bus to any resort is a good one. There's always DTD, too. We're looking to try Raglan Road next trip.