Hello I have reviewed a lot of things on speed cube shop. I do have to names. you may know me as S.A. but i usually use the name J.T. Anyway I am a big fan of UV coating.
I do recommend the UV coated version because in competition it does make it more grippy.
I recommend black pieces over gray pieces because it helps a lot with recognition. in other words, it is easier to tell the difference between two colors. so the answer to the first question what cube should i get? the final result is the Stickerless (black) (UV coated).