My favourite would be Blue with CCH accents ... or nickel with fire blue screws .... or old-time blue with yellow ivory ... or ...
Heck - I like 'em ALL!
I actually have only one nickel gun, and it's a Colt Python in electroless nickel that got polished out (about 75%) due to a problem ... but since it's NOT a gun of our era, it doesn't count for this discussion. I have an old model Vaquero (that doesn't see NCOWS use due to the mods I did to it - brass bird-head grip and some other mods) that is polished and looks pretty much like nickel (BUT - I'm with Del - Nickel has a bluish cast, Chrome has a yellow cast, and SS is different, too, with Sterling having a whitish cast, too) but everything else I have is blued. I WOULD like a real nickel gun to add to the stable, (I'd LOVE to have a nickeled Merwin-Hulbert with several barrels and dual cylinders - 44-40/44Spl/Russ, etc. in nickel with Ivory or at LEAST Mammoth grips but I'm afraid my gun buying days are pretty much done. Besides ... the jury ain't done on the "new" M-H'es or IF they'll even arrive!)