In reply to Kemics:
These days my climbing is mainly indoor bouldering, so perhaps not best qualified to answer your question. But here goes anyway:
I wear Anasazi VCS size 8.5 and Katanas Velcro 7.5
I find some problems i can do in one shoe but not the other. But I guess it will vary from person to person depending on ability, technique, shape of foot, temprature and loads of other things.
I find the Katanas are generally better for heel hooks. They also seem to be more sensitive and give more feedback through your feet. When i first got them they were great on tiny foot holds, but as they have worn in i have found their edging ability has deteriorated slightly more than my Anazazi's have over the same period. Also the extra sensitivity very occasionally makes it painful when my weight is all on one toe on a small hold.
The Katanas seem to wear out a little quicker than the Anasazi's, but not to a ridiculous extent.
In general I prefer the Anasazis. They seem to perform excellent on really small holds and last longer and are a bit cheaper.
Overall i guess if it aint broke...