Corbenik

Even though this is old, I'll put in my opinion for those who still play this based on weight, DT, and perks and that they are faction-less (whatever bonuses the armor gives)

There will be two lists, one without any add ons, and one with all add ons.

No add ons

Heavy: Remnants Power Armor AKA Advanced power armor. Highest DT of any armor out there, plus rad resistance for both helmet and suit. It has less Rad resistance the the T-51 power armor and gives CHR -1, the T-51 gives CHR +1. With all the DT increasing perks and sub dermal implant, you have a massive 47DT against attacks, and 52 against melee (With proper perk)

Medium: Ganon Family Tesla Armor: Easily the best medium armor, Helmet gives 6DT, +5 rad resistance and -1 CHR (Just like remnants) The suit gives 26DT +10 rad resistance and +20 energy weapons. The suit looks just like the Remnants power armor, but is covered in little coils that give off electricity. Both these armors require power armor training to wear. Two Remnants power can be obtained, and only one Ganon Family armor can. Both can be obtained via "For Auld Lane Sane" companion quest. You get power armor training and the remnants armor by completing the quest but after it Arcade will ask if you want his help, if you ay yes, he will fight with you using the Ganon family armor, if no, he gives you the armor and can no longer be a companion. Another suit of Remnants Power Armor can be obtained from two locations. The suit is at the Deathclaw Promontory, its an unmarked locations on the other side of the river. There are roughly 24 Deathclaws, 7 young, 2 mothers, and 1 alpha male. The helmet is in Silver Peak Mine which is full of Cazadores and a Legendary Cazadore. The thing that sucks about these armors is that they have the LOWEST durability of any power armor in the game, if you don't have the jury rigger perk, they will break fast.

Light (clothing): Bounty Hunter Duster: 6 DT, +5 Guns, +1 CHR, can be obtained VIA Atmoic wrangler through a quest.

Light (armor): Vault 34 Security armor: suit 16DT, helmet 3DT, can be found in vault 34 only 2 exist. This one also has very low health

With add ons

Heavy: Sierra scorched armor (Lonesome road), 24 DT +2 HP, +1 STR, +25 fire resistance. Has a little less DT than the remnants but 4 times the durability

Medium: Tied with Ganon Family Tesla Armor and Elite Riot gear (Lonesome road), The ganon is tougher, but the they both give unique perks. Elite gear suit 22DT, +5% critical chance, +10 guns, Helmet: 6DT, +5 speech, +2 PER, Sneak sight (Night vison while sneaking at certain times of day)

Light Armor: Sierra Madre Reinforced Armor (Dead money), Suit DT 18, Helmet 5DT. Even though there are a lot of light armors that give cool bonuses, this one DT blow em out of the water.

This is kind of my opinion over others but I think that the stealth suit MK II (Old world blues) is the best medium armor when it has all its upgrades No helmet, but the suit gives, 14DT, +25 sneak, +1 AGL, +1 PER, +20% sneak speed, (speed while sneaking). This paired with the Old world blues sneak speed implant makes it so you can sneak faster than you can run. Which makes it perfect for players who like their sneak attacks.