I have never had either cut but am getting my first Deva cut tomorrow. I have read good and bad about both but it seems like a lot of people prefer the Deva cut to the "carve and slice" from Ouidad as I believe I read it's harder to grow out. I think it may also depend your hair's texture, etc.
I'm sure some of the more experienced curlies here will be able to give you a better answer. Good luck.