I think the PS2 facilitates RPGs a lot better, for a few reasons. The main one is that the PS1 and PS2 are pixel based rather that polygons, and for some reason the pixeled RPGs look a lot better to me that way.
I personally think the RPG's are the best as well. PS2 has a long-standing line-up of RPG's. It continues sagas such as Final Fantasy, Xenosaga, Kingdom Hearts 2 is coming soon, Breath of Fire, and many others.