Thing with 1def pures is as soon as you move into med crater, you get absolutely powned, because you're only 1 def. While a zerker pure might have a kill to death ratio of 5:1 or 6:1, with 1 def pures it's more like 3:1 or 2:1, not because they're any worse, but because they're 1 def. If you get unlucky and come across a void dbower and a 99 str kid at the same time, you're gonna have to do some awesome tanking... but that's in med crater. Untill you get there, you won't have to worry... But 1 def pures die a lot, so I prefer zerker pures