I don't know that one is better than the other. They are very different types of pieces. Once is a short A-B-A improvisatory type piece while the other parallels an epic poem. It depends on the character of the rest of the pieces in your program.
I'm sure that's not the answer you wanted, so I will tell you that I prefer the Ballade, as there is more dramatic development (which appeals to me personally). Of course, they are in different worlds technically, so perhaps that is a consideration. Beware the presto coda.