I'll say it....
Buy one of each... :)
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Not much, but I can maneuver better with a 5/8. I do love my 6/8's more though. Something about the bigger blade makes me happy. Now 7/8's are just obnoxiously big.
I prefer 6/8 to 5/8, just because I have a preference to larger blades 7/8 is for me the perfect width, have a few 8/8's also, and one 9/8, which shaves very good, jus takes a better feel around the face.