Yeah. Double exp or a huge increase of exp, one or the other. While a totally different series altogether, the same with Breath of Fire 2. The GBA version is the better version because of this.
Well. In Dragon Warrior 7, you'll probably doing side quests along the way, breaking every vase to find tiny medals, etc, so you'll probably hit the end at maybe 70 hours or so. The thing is, is that the game is legitimately long though, but it's not one of those games that you get a part of the way through and you're hoping will end soon. That's happened to me before with a few games. That kind of feeling, no matter how enjoyable it was early on, just ruins the game because it drags on too long. That feeling probably isn't there in Dragon Warrior 7 because each town has its own mini story that you conclude to save the town. One town can be saved or destroyed, though(I chose poorly.)
The two largest side quests in Dragon Warrior 7 is a monster town and your own town. With the monster town, I actually thought it was a really unique aspect of the game. It ends up taking a ridiculously long time to fill, but you have a huge town with nothing but monsters that you've captured. You can't purchase anything or anything like that, just have a large town that has multiple types of areas that different monsters will hang out at in the town. You can talk to them, they'll each give you a couple different lines of text that really doesn't do anything, just might be a humorous comment. With your town, depending on the way you build it, it can be a normal town, a monastery, a merchant town, or slums(yes, I used a guide from Gamefaqs to find out how to unlock each of them.) Each town gives you some of the best equipment in the game, so you'll probably want to work towards them all, finishing with the slums since it has a casino.