I second that I use 6/8 and 7/8 exclusively. Occasionally I have a old Dovo 5/8 that I shave with it really does feel like a toy. Also I think the wider blades lend themselves to more proper stropping and honing.
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I started off with a full hollow 5/8 and it worked just fine. As I discovered my beard was quite thick/coarse, I went for a 6/8 and then decided a wedge or half wedge was good for me. Then, I discovered some 6/8 or 13/16 full hollow and found that these shaved just as well. I currently have three full hollows and one quarter grind razor which is superb on days I have a little extra growth. You can't beat a nice quality razor from the past days, as these take a superb edge better than anything made these days. So to me it doesn't matter on the grind.
+1 for 6/8 or 7/8. I use 1/4 grind. My beard is steel wire and the 1/4 grind cuts through it.
I love them all! All sizes, all grinds! :-)
Anything from 4/8 to 8/8 (17/16) is just fine to me, as well as wedge grind to extra grind. And that's for a reason: every size and every grind allows you different shaving techniques and different results.
Both size and grind contribute to the weight of the blade, therefore to the way you use it.
I have not tried nearly enough to know, but at this point I feel as though bigger is better.