I think this is a very easy Chrono Trigger. I'd say CT has among the best optional content of any game. A bunch of optional, yet nonetheless very story-filled character based side quests at the end. A bunch of potential endings at least a few of which are accessible on a first playthrough and several more on new game +. By the way, as far as I know this was the first game to have new game + (at least the first I played) and it did it so well.

Not really sure what exactly BoF III has for optional content other than Masters and finding all the dragon genes/equipment stuff, so this is very lopsided. Fishing too I guess, whatever. I'd probably choose CT over BoFIII on just about every category, but this one is a particularly stark contrast