Both clasps are top in my opinion. I have skinny wrists but rather bony hands, thus I am big fan of the sliding Omega clasp that makes getting the watch over the knuckles easy. But also Grand Seiko had machined a rather long and thick deployant, so putting the Grand Seiko on skinny wrists with big hands, is not a problem either. Please note that both claps have a similar height when closed. What is amazing however is, that Grand Seiko had curved the deployant very nicely, my wrist dimensions must be close to "Japanese standards". On most other watches the deployant is not curved enough and then does not lay that nicely along the under side of the wrist.