I debated nearly the same.
It came down to, I walked into a shop, they had the 5.5" bull barrel in blue, and it's a nice blue finish.. so I walked out the door with it.
Stainless IS softer than most carbon steels, so may loose some luster quicker than a blued barrel.
But really it's a range toy for me. Pull it out of the rug, shoot, put back into the rug, take home and clean / wipe down.
I also dropped a red dot sight on top. That in itself is just fun to shoot with.