However, all the stuff you find on Trappers and other characters is beaten, and used. The Marine Combat Armor, which can be found throughout the island is easily the best armor you can find in the game, outside of just using Power Armor. There are many different kinds of armor, with some being better than others, but with the release of Fallout 4 Far Harbor there is little doubt of which is the very best.
Aside from your level, and what weapon you are using, your armor is the most important thing you have on you in Fallout 4.