Monk or SK

[Bazia]

the insane damage and utility both those classes bring together make it hard to justify picking any other class unless to sacrifice yourself by fulfilling less important and fun but still needed roles like the one warrior/enc/shm or the two to three clr/brd/wiz for raids

as far as pvp goes a good example is 3 rogues or t staff monks will kill a rogue/enc/clr

3 rogues or t staff monks will kill a shm/mnk/brd

rogues or t staff monks will kill any other combination of classes that aren't rogues or t staff monks no matter the scale of numbers assuming you aren't massively outplayed or outnumbered