My 3rd favorite class was defender (Warlock + Templah always #1 / 2)
To comment on this isen also has the advantage of aspd stones and possibly movement speed stones. Fox outclasses this but I exclusively pvped with royal dragon when I was playing. Literally no situation where it isnt good. I could play defender with the sprint scroll (I could get an avg of 60 sprint scrolls a week multilogging for CV) plus the dragon and outrun people with fixation on. If you were to use a fox and aspd stone you would have almost no aspd penalty but I always petitioned from day 1 for defender blunt mastery to give 20-25% aspd.
Aside from that defenders need a huge overhaul to be better than guards, too many useless skills in the defender tree that need to be changed out!