I would like to preface my take on Condi Rev with the following: I find my build does well with condition damage, but probably will not do the same level of condition damage as a more specialized build. It depends a little bit on what you specifically aim to accomplish. For my own revenant, I wanted a build capable of handling effectively every role: healer, tank, damage or conditions.
I chose to build all-celestial, using Sword/Shield, and Hammer as main weapon sets. You might choose to go veratas or something on your accessories and rings, but here I also went celestial.
I usually stick to Legendary Dragon/ Demon, but in principle any of the legendary stances is viable with my build. He’s okay at everything, but exceptional at nothing. The bonus to healing power and toughness makes Ventari stance very attractive, in combination with Mallyx. Dragon stance combos exceptionally well with sword/shield if you spec for might per boon on your revenant.
This build is treating me well, I must say.