I agree with Joekras - I would expect anyone who seriously auditioned the Revels and the Dyn's to have a clear favorite (though I could imagine somebody loving both).
Regarding x-overs, I'm definitely not an expert. I have read several places that you can only get time and phase coherence out of a first-order design. That, coupled with the bigger overlap of the softer slope of a first order x-over would lead me to say that you'll get better driver-intergration out of a first-order x-over than a higher order one. This is the opposite of what Joekras says, and I'm definitely not here to say I positively know I'm correct. In any case, better driver integration means that you're less likely to pick out the sound of each individual driver in a speaker and more likely to hear the sound as one cohesive "voice".
Higher-order x-overs tend to generate a bigger sweet spot. The ones I have listened to sounded softer / less-bright as a result of this. This could yield an audition where the listener thought the first-order x-over was more "exciting", though long term listening is what counts and that excitement may easily turn to fatigue. In any case, if you're likely to utilize the speakers in a place where a wider sweet spot is a benefit, you're more likely to get it in something like the Revel. -Kirk