I am certainly no expert, but it is my understanding that Carbon Steel can be made to have better properties for a gun than Stainless Steel. That is why many gunmakers choose CS and a Hard Chrome finish over SS. I am not going to say how much better the CS is, and for most uses it probably doesn't matter.
I compare the difference to that of a Forged frame versus a Cast frame. The Forged frame is probably better, but are you ever going to be able to tell the difference? Probably not.
Chrome Moly has it's advantages and so does Stainless Steel.. one of the drawbacks of Stainless Steel is proper lubrication to prevent galling.. it's really a personal preferance decision but you should make yourself aware of the drawbacks of each. It may be easier to keep a Stainless pistol like new than a chrome moly, due to the finishes that need/can be applied to chrome moly so it will not rust.