If it comes down to it, only only one choice...I pick my Bull Barreled 223. I love both Standard and Bull Barrel, and both shoot great. But the feel and balance of a 24" BB in a Handi is a nice thing, not to mention it shoot's a hair better then it's little brother
NEF/H&R barrels are usually thicker than most other manufactures barrels, and are often misquoted as being BB in Ads when they are actually just a Standard.
Any particular reason for stainless?
I like stainless too, but with my 22" Standard blued barrel, I just cleaned it real good and used Kryon black semi-matte finish on it. Rugged, and looks good too, nice and clean.
Both will do what ya need them too, but my preferance is the BB.
-Aaron