[QUOTE=kikix12;4837545However, I would think that it's not as clear-cut for Alliance Raid and Normal Raid.[/QUOTE]

Indeed not. There you can't simply say that one is easier than the other since it varies so much between individual raids.
For example, Labyrinth of the Ancients and Syrcus Tower are very easy as long as you have a half-decent group. Dun Scaith on the other hand is not all that easy.
Same with the Normal raids - some are easy, and some are anything but easy. And then we have Coils, which doesn't appear in roulettes, which is hard when done synced.