I honestly wasn't impressed with the Knight from what I played in the training room. Not as fun as the Paly, IMO. I think I'm gonna scoop up Kinetic, then pick up the Divine Form while I solidify that.
I really enjoyed the reflection shield the knight gets. Just stand in an aoe pop it and destroy anything around you.
I might knight down the road but ill def have pally ready for dungeons/raids and work on the slayer as my fun class.