I personally don't fix the wear spots, I don't mind the imperfections as long as I didn't cause them. One of my machines even has the name "Yannik" scratched in the siderail. I doubt that I will ever fix it, I almost even like it. (I realize that I am the odd man out on this one).
I would recommend cleaning and waxing first, and then if you can't live with the wear, fix it. If you aren't able to get a good match, you might make it look worse than when you started.