Regular armor is totally up to the user on which they wear, but when we’re talking about Pistol builds… well, actually any build pretty much, you’re going to want to go with Secret Service armor, which is purchased with Gold Bullion after completing the Wastelander’s main campaign. It provides an insane amount of armor, better than anything else, and the ONLY problem is that you need to buy it at the extremely expensive price and then HOPE you roll some good perks on it.
By the way, quick note, if you’re wanting to use a bloodied build with the Gauss Pistol (which is where Nerd Rage comes in handy, and damage goes crazy) you’ll want to definitely stick to either Unyielding or Bolstering if you’re dying a lot.
If you can’t get Secret Service armor just yet, don’t worry about it, as long as you have armor like Combat Armor, Brotherhood Recon, or Marine Armor. Speaking of perks, these are the ones you’ll want to look out for: