Return of Reckoning

What are the most commonly used classes per role and faction for keep defences, and why are these so favoured?

magus and engineer are king due to tons of sustained AoE damage and choke point punishing opportunities.

Magus does more damage overall, but engineer can be tankier and more self sufficient/support thanks to keg and things like armor racial tactic.

I'd agree with Jaycub and add SW/SH to the mix. If played/specced right, they can straight merc someone without much fear of retaliation due to burst and range advantages.