[Vexx]

I don't see that the like or dislike for either show has to be binary ("we loves our precioussses and hates the other!") but really there's zero similiarity outside of:
1) same "girl comic" art style.
2) inverse harem (1 girl, 4 guys) with one obvious leader

There was a lot of "ooh, if you like Ouran you'll like this" early on that made little sense.

For my part, I'm having some trouble enjoying the art style of the guys ... even more so than I initially did with Ouran. It isn't the "femme styling"... it is that the eyes of the guys just seem "pan saucer dead" especially the young one. They're saying the lines but I'm not getting the feeling through the facial expressions. Comparing the animation and art with with shows like H&C/Bokura or even Ouran -- those just seem to have done a better job of facial animation and eye expression. As usual, (imo)(ymmv)(no express warranty).