Hi Obie,
I only have three razors so far, plus a microtome that I use occasionally, and all of them are 5/8" or 6/8" and hollow ground so theres not much difference between them. My Edelweisse seems to have a stiffer blade for some reason but thats about it.
So I just go with whichever one I feel like that day...!
Some day I hope to have enough razors that I need to work out a system..! :-)
Best,
Stuart