Are deadric weapons and armor always going to be most powerful or are there weapons and armor which are stronger? If so name them and there location id like to know the most powerful sword, armor etc in lore.
On average, a piece of Daedric armor as worn by the Dremora Lords* is the strongest base set of armor and weapons to be encountered in Tamriel.
However, individual Artifacts of various origins can far outvalue any of these rank and file suits of armor or weapons. Just to give an example, the cuirass Lord's Mail can probably absorb damage far better than the average Dremora captain's cuirass, which is often simply called a "Daedric Cuirass" by mortals, and it can heal the user and cure poisons to boot. It's much lighter, too. And that's just one example...if you wanna talk about weapons, Goldbrand does far more damage in the long run to creatures not resistant to fire, or better yet weak to it, and even without its charge it easily rivals a Daedric longsword. Stendarr's hammer could kill a giant in a single blow (if anyone could lift it.)
(let's be honest, it should really be called Dremora Soldier Armor. There are countless varieties of Daedric armor and weapons in existence. Other examples include the Daedric Artifacts themselves and sets of Golden Saint and Dark Seducer armor.)