It seems that some people favor smaller blades for detail work, but like the others have said it's mostly personal preference.

I have used 4/8, 5/8, and 6/8 and everything from full hollow to quarter hollow.

One thing I will say is that I prefer my quarter hollow for its ability to plow through my coarse beard. General consensus seems to be that the stiffer grinds don't flex as much and are better for a coarse beard. With proper technique though, I'm sure you can shave with anything.

Keep in mind that I'm a n00b too, I just managed to snatch several very different razors from an antique store to go with my new Dovos.

I like my full hollows ok, but I like my quarter hollow better.

I haven't used any of the big 7/8 or 8/8 razors, but have heard that some of them can be heavy enough that just the weight of the blade causes too much pressure. Doesn't stop me from wanting to get a meat chopper.