I live in WA state, and we get a lot of drizzle here during hunting season. As long as you take good care of the rifle, blued vs stainless is pretty much a wash. I wipe down the guns with a sheepskin with Outers Gun Grease on it after every hunt. Pretty dependable.
If you are inclined to hunt, toss the rifle in the back and drive home before cleaning it, stainless might be a better option. I don't think there is any difference in the woods as far as visibility of the metal, as long as it isn't shiny bright.
I like fiberglass stocks for their lack of warping. I had a really pretty myrtlewood stock on my 7X57 start warping on me, and before I knew it I couldn't hold zero from one week to the next. Fiberglass may not be pretty, but it is tops in wet weather.