Dark Knight or Gunbreaker

[Rowde]

I ll be honest as a main tank, DK and Gunbreaker are the worst check in order :

Paladin Rank 1 Best defense, good dps, can heal and have the strongest attacks, can use magic attacks, great at pvp
Warrior Rank 2 Good defense, Best dps, great at pvp
Gunbreaker Rank 3 Good defense, Bad dps, very bad at pvp
Dark Knight Rank 4 Bad defense, good dps, bad at pvp

yeah there's a bunch of stuff that is wrong in that
you're just showing your personal bias