It all comes down to personal preference I think. Some like large while some like smaller. I find that smaller seem to handle easier for me under my nose, but a larger blade works just as well. Other than larger ones might hold more lather on them while shaving before having to be rinsed or wiped off they all shave the same. Grinds on the other hand that is another matter, but still comes down to what you like. That is where it starts to get out of hand, having to try them all.