Alberta Ed pretty much said it. I have been a Buck fan for many, many years. They are great bangs for the "Buck" (sorry) and good beaters. They have a very stainless stainless and are not prone to corrosion. However, I have seen easier knives to sharpen. Marbles, on the other hand, are carbon steel, and a very good version of carbon steel, IMO. It seems to provide a better edge and one that is easier to keep keen. Bit it requires more care as it is carbon.
You would be set if you bought one of each.
I would get a Buck for the situations where care is not that easy and the Marbles for those times when care is an affordable luxury and a good, easy to keep edge is needed.
Two great choices for the money!
Buck gives you a nice leather sheath where Marbles gives you what they call a sheath but you will likely buy an aftermarket replacement.
BTW, Customer Service is great at Buck and just as good at Marbles, according to what I am told.
[This message has been edited by Nimrod (edited 10-29-2000).]