Overall I thing that ultras are one big pile of shit that reeks and it was purely coincidence Juve ultras were not involved in any of the clashes (well, we would be definitely involved in more of this if not our great sporting achievements, which contributes to less tensions among the fans) as they all think the same and generally lacks brain cells, I would never think that some ultras are worse than others, never.
As discussed many times here, ultras are a cancer and it's hard to cure.