I didn't care too much for VI's levelling system, you got, say 1 or 2 stats at the most per level depending on which Esper you have equipped. VII had a much better system, you simply gained some stats with each level like the previous ones.[ I think you did, I might be confusing 7 with another one] So I liked VII much better beacuse it wasn't a pain in the neck to raise your characters stats.