Since Ocarina is getting redone, I think it would only please fans that much more to see Majora's Mask redone. Plus, I would like to do some of those sidequests in better quality, just to understand what's going on. I have a big TV that alters the graphics...
To be honest, none. I prefer that they spend their time on making new, creative, innovative games, not not giving us the same thing again and again. However, if I had to pick one, it would be A Link to the Past. The GBA version was really just a port, and a remake for this game would be pretty cool.
Honestly I'd be interested to see how they'd handle a remake of Adventure of Link. The advances in available software technology since it was first made mean it'd be more than possible, especially if they want to put in any retconning they hadn't thought up before the release.
Since I never had a chance to play BS Legend of Zelda I would want to see a remake of the original LoZ. With upgraded graphics and maybe a few more secrets and puzzles placed throughout. I am not so sure about it being in 3D though. The map in LoZ is kind of small for a 3D environment, it would look like roaming around a mix of the lost woods and Death mountain with dungeons. So just a simple 16 or 32 bit update would be good enough for me.
I voted for Oracles/LA. Firstly, because I don't own LA and lost OoS many long years ago.... But I enjoy playing OoA on my GBSP a lot. When I would go down the shore during the summer, I'd bring my GBSP and play OoA during the two hour ride. I think it would be cool to finally play (and re-play) LA and OoS, and get the opportunity to play OoA in 3D.
To be honest any of the 2D games done in 3D would constitute such a huge switch in gameplay that it would be like an all new game.
I'm not sure about MM being updated, because I thought the original was amazing and in some ways I don't want to touch it. It's like Axle said in one of his videos: part of the magic of that game is how mysterious it is. We don't want to spoil that.