I have found all the Cirque shows to be very similar in execution. Each has it's own unique theme and music, of course, but each are (to my mind) variations on the same thing; amazingly talented acrobats and dancers doing what they do best. The costumes change, the sets are different, but ultimately each show is the same.
I have seen "oVo". It is no better or worse than any of the others I've seen. I was very impressed by it. I'm very impressed by all the Cirque shows I've seen. So, for me, it comes down to either the setting/theme or the music. Since I am a Beatles fan, "Love" stands out for me and is the only one I can see over and over. The next two are "O" and "Ka"