What's the better character card deck set, Thief or Pirate?

If it were summon DAMAGE instead of DURATION it wouldn't be such a s'hitty card. Mechanic is better than sair simply because base durations are far longer for buffs than for summons and pretty much every single summon is lagless casting whereas buffing can be upwards of 15-30 seconds depending on the class and amount of decent skills so the less often you have to do that the better it is for damage over time.