it depends on what your looking for. stealth: chinese stealth armor defense: winterized t51b power armor offense: tribal power armor
generally the best armor comes from the dlc's.
- A really good armor I found was underground/tunnel in Old Olney (watch out for Deathclaws!) which was the Prototype Medic Armor. I found this perfect when originally scouting the wasteland earlier on in the game as it yells when an ememy has spotted you so you can go into VATS when you hear GEAR UP SOLDIER! lol. It can be repaired with Combat Armor. My alltime favourite is the Reilly's Rangers armor with its +1 LCK and Small Guns bonus which is offered at the end of the quest Reilly's Rangers (choice between that and Brick's minigun).