Ya, it just totally depends on where you plan to take the acc.
If you're only going to be pvping I say 1 def. But zerker gives you options for pretty much everything and multiple styles of pking with like void and shit.
Also access to better loot when pking compared to 3k pure loots xd.
Also, 100 to 0 means killing them quickly basically. Term is used throughout a lot of games where pvp is involved.