stainless is more durable for the lifetime of the rifle, But blued guns look better.
stainless is more rust resistant
high speed buffer of some sort would be better.....sandpaper removes material too fast.......in either case, just make sure you're working the metal in the same direction of the original finish...or it's not gonna turn out very pretty..lolIf you marred the finish on stainless you can hit with a high grit sandpaper & remove the mark
+1......for saying "MORE RUST RESISTANT"
stainless = stains less