To quote myself:
Revan and Kun share the same style of hype, same style of accolades, very similar demonstrations of their skill, duels that share similar impressive circumstances... but Revan's are also just clearly better which is easy to judge based on the similarities.
Really I don't see how Exar can be possibly superior unless you use that powerscalling from the Ancients. Exar and Revan are incredibly similar in how their hype is constructed, how their best skill feats are constructed, etc. etc. but Revan's also edge out Kun in any of these areas.