But 3 has had more re-releases so BG being most recent not so much.but why are we comparing two uncomparable games?
You are preaching to the choir. If the world forced me to chose between FF3 and Baldur's Gate then it's be a pretty good situation, you can't go wrong either way. Get them both. Is it bad that I've considered getting an iPad just to enjoy Baldur's Gate again?
FF3 is having a time limited sale, Baldur's Gate will likely not increase in price so if finances are the only concern I say go FF3 and get Baldur's Gate as soon as possible later.