Surface pits can sometimes be micro welded. I'd rather add metal to the pit areas than remove metal from the areas around them. As to the need to remove them it depends on their size, the location and your tolerance for them. Some of us can ignore anything and others are bothered by the slightest thing.
From what you have said I'd think about it in other terms. Which gun will you use the most and get the most enjoyment out of? That's the gun I'd do first and I'd put as much money into it as you reasonably can because you will get the most bang back for your investment. Plus you will be adding some condition in a cosmetic sense which will help prevent future wear and loss of condition.
