Blued Steel and Polished Walnut.
The finish on my 20's-vintage Colt 1903 reflects well enough to read through, and is midnight black everywhere except the details like the safety and trigger. THOSE are brilliant cobalt/electic blue mirrors.
And as for wood, well, I'm a professional woodworker. I like the stuff.
That said, stainless can be cool. My 1066 would look kinda funny in blue. The Monster is nicely "over-the-top" shiny. It's supposed to be seen. An Automag wouldn't be an Automag unless it was a stretched stainless monstrosity. Big stainless revolvers make the holes in the barrel and cylinder look bigger when you point 'em at unfriendlies, and they don't rust.
But against bluing and color case-hardening, stainless is flat boring. And then there's a finish I like to call Honest Wear, the ancient dull gray patina on well-used-but-not-abused antique cowboy guns.
Elmer Kieth had a Colt SAA that'd been heavily copper plated, that tarnished a heavy brown-black with bronze highlights. It didn't rust. That finish intrigues the heck out of me.
And where do you put Target Gray? I saw a GP-100 with that finish, and it looked pretty stylish. Almost better than my blued GP-100.
I guess I like most finishes, except for cheap nickel plating, and powdercoats. Plastic frames are, well, plastic. It's boring as all get out, unless you color it, which is kind of unsettling on guns. (Although my Colt .22 Auto looks snazzy in matte stailess with a black plastig grip frame.)
I saw a Glock with a nickel-plated slide once. It looked like a Jennings/Bryco POS. MOST undignified, really. Almost vulgar.