Just to add my .02c
For the question of the J v L ...I find the J a much harder prospect than the L....fighting the same person (8spade) I have an easier time...last more turns...when he is in the L...
Even that comparison aside...from my side the J seems to be a much harder fight than the L, not sure if it all comes down to pilot skill or what but that is what I find...and if I see a G...then I run...cause uberness is in that one (pilot that is)
..Actually, I think I've even fought 8spade when he was in one of them too../.