I like FFA the best. I have played through Sword of Mana, but in my opinion, the original story of the old game is a little bit more..."epic". Also I like the ending of FFA better, it is "good" and "tragic" at the same time and in Sword of Mana the same scene looks rather poor.
I like the music and the graphics of the remake but the story in FFA leaves a lot more things to the players imagination when it comes to the story
But that opinion can come from my nostalgic feelings for FFA. It was the first Adventure I've ever played and the first game for my Game Boy