None, I'm just not all that interested in playing mainline Pokemon games anymore. And if I were going to get back into them, I'd try a newer game to experience how it's changed since Gold/Silver.
I do think the Pokemon Bank compatibility is pretty cool, and $10 isn't an unfair price. If I had to pick one of the three, I'd probably get Red, since I already had Blue and Yellow as a kid. Well, we also had Red, but that was my brother's.
None for now. 10 dollars is pretty ridiculous, even with the preserved multiplayer function. Plus, I'm more than content with the wonderful gen 1 remakes on GBA.
However, I might be tempted to pick up Yellow if it goes on sale for less than $5. It seems pretty novel and charming to start with a Pikachu that follows you around. I loved having my Pokemon follow me in the gen 2 remakes.
I guess there was no room for a "simply not interested" option. I appreciate what these games did to start a phenomenon, but I find them too primitive to enjoy today. If they put up the Gen II games sometime, I might bite on Crystal.
10 bucks is too much. Kinda feels like they're gouging us a bit. I understand that the trading feature is updated (which is nice), but I have zero interest in Pokemon Bank, so I'd hypothetically mainly be just getting this to play it normally. At 5 or 6 dollars, I'd get it, but not 250% of a normal GB game. I'd rather just play Trading Card Game instead!
If I were to buy any it would be Red. It's the only version I don't already own. But I really don't have any desire to buy it. I will play through my copy of Pokemon Blue every now and again just for nostalgia sake so it's not like having a copy on my 3ds would be any big deal for me.
None. I don't like to double-dip on games that I still own, and I'm not hardcore into Pokemon enough to care if I have the ability to trade Pokemon from Red, Blue, and Yellow to the newest versions or not.
I am buying pokemon blue tomorrow and once I am done reliving that nostalgia, I am getting pokemon yellow. We will see how pokemoned out I am and if I even get yellow by the time I trudge through blue.