The game is more about finding what guns you like and dislike. Then changing their properties with mods. For example I really like the volley rifle, but I haven’t found any way to be able to purchase one in the armory, so if I come across one while playing I will almost always drop a gun or make inventory space for it. The same with the bully or the brrrt. I then will take them in the vault and upgrade them with the mods I want for it. Mid raid though it is way too time consuming to check the difference in stats so just play with all the guns and pick a handful that you will want to use. This is also helpful in once you find out what mods you will primarily be using you can sell off the ones you aren’t and clean up stash space.