I started working on a tyrant. Currently lvl 34 monk and I am very happy with it. Can absorb a lot of dmg even in light armor. (I was actually asked to tank in RB party when we had no tank, and it worked) And I really love the skills and totems they get. I'm only 34, but with ww2, zerk1 and wolf totem my speed is 185, and it will only get higher with time. I am not regretting one minute of my decision to go tyrant instead of destroyer. But I seen some really tough looking destroyers and the decision wasnt a easy one :).
Pros:
-High HP(second highest in the game)
-High DPS(Highest momentary DPS in the game)
-Ability to 1-shot _any_ class(Frenzy+Rage+full buffs +crit = bye bye even tank classes, 19k dmg to NM heavy)
-Ability to use polearms, blunts, 2handers efficiently
-Battleroar self heal/self BTB
-2 stuns/3 stuns when Titan
-High dmg skills(Fatal Strike, Crush of Doom)
-Frenzy, Rage and Guts
Cons:
-slow runspeed
-low accuracy(on bows mainly)
-low mdef
-slow attack speed when using 2handers
-no slow skills
-Guts only boosting Pdef, not Mdef
Tyrant
Pros:
-High HP(Highest in the game)
-High DPS
-Highest attack speed
-versatility due to totems
-Highest runspeed in the game(momentary only)
-high dmg skills
-stun with main weapon
-slow with main weapon(Cripple)
Cons:
-low mdef
-not many weapon choices
-short duration on totems
-high lvling cost