the Enclave Remanats armor has 28 in DT so it´s the most powerful in the game. But the weapons depend on what you train. On my opinion is it Dinner Bell and Brush gunWeapon: Probably CZ57 Avenger or Gatling laser for unarmored targets, and YCS/187 (or whatever were the numbers), or Anti-Materiel rifle for things like deathclaws. All-American or This Machine is somewhere between them.
Armor: Remnants Power Armor purely looking at DT, however CH -1 effect is rather annoying, so thus I prefer T-51b Power Armor.