I have just been going through a similar decision process, but in the other direction... so far.
I dug the last two guns exposed to smoke and water back in 2010 out of their oil filled baggies. Sig Sauers, a P220 and a P225. I took them apart, cleaned out the soot, old fouling, and dirty oil, gave them clean lube and put them back together. They shoot just fine.
The "up side" of the slide and trigger have a very mottled appearance, I guess from dirty fire hose water dripping on them. The steel parts on the down side, the decocking lever, takedown lever, and slide stop, are unmarred and the anodized aluminum receiver unaffected anywhere.
Oxpho Blue nicely blackened a couple of old scratches, but did not affect the mottled areas at all.
So, I can either have the slides and triggers refinished or I can just leave them as is. I have already been shooting a Plastic M&P with nearly as damaged finish, so I am not wedded to the notion of perfectly finished guns. And I just hate the idea of having to take those things apart again. "Modern" pistols may be simpler to field strip than the good old 1911, but they can be a bear to completely disassemble, and really tedious to reassemble.