Power or Condi?
Power for sure. Condi guard is just a joke so ANet can say that guard can be super versatile and kitten. If you’re running pve content, buy full zerker’s gear and google a nice dps build. I personally run 10/25/30/5/0, but there are alternative setups to fit your style of play.
For your second question, Fiery Wrath is definitely viable and in fact it is incorporated into most dps-oriented builds. Kindled Zeal on the other hand is kinda eh. The only damaging condition guardians can apply regularly is Burning. None of the +% damage applies to conditions and usually your burn will be quickly outshined by other classes such as Necro or Engi. What this means as a “hybrid” is that half your damage is being lost to other people in your group, essentially slowing down your run.