Well, the main issues that come up generally between blued/ss weapons are aesthetics, price, and durability.
Some people like the way one looks over the other. Some will also aruge that the SS will give away your position more at night.
SS tends to be more expensive, but not by too much usually under $100.
SS tends to be more rust resistant and the "finish" will last longer, because it is stainless steel instead of a finish put on the metal.
Personally, I like big revolvers in stainless, but thats just me.
What do you want the gun for 6" is a bit long for CC, so is it mostly a range gun, HD gun, hunting gun?