In the case of the purchase, SS goes for more.

Aftermarket they are the same.

No one seems to agree on SS lasting longer (barrel wear) vs Chromolly Steel.

You can actually get a CM unfinished (aka in the White) and it looks about the same as SS. If its target only, a bit of oil and it stays quite nice.

My aftermarket barrels are SS as I like the contrasting looks between a blue/black receiver and the barrel.