I would have to say that either one is fine in levelling up your characters. Either way you are going to be spending an awful long time running around to get into battles.
The Farplane has a constant level of difficulty. Via Infinito does as well. You just have to get onto the higher numbered floors to get the more difficult ones.
I have not finished the Via Infinito section yet. I got bored with it at about 60. I never spent a lot of time just levelling up my characters. I just let the story progress in a natural way. I did do all that I could to get the dresspheres. That was the only time I would battle outside of the main story line.
Bookmarks