Has anybody compared dragonscale? is the light armor version of it the best for light armor?
As far as armor rating is concerned, Dragon Scale Armor is marginally better than Glass. But late in the Thieves' Guild quest line you get (marginally) better armor. Enchantments are another matter, though.
And yeh, Daedric armor appears to be the best craftable.
The best heavy armor, and the best in game, as far as I know. Again, as far as armor rating is concerned.
The main advantage of dragon stuff is that it's cheap to make, since you get the signature ingredients for free in large quantities. Heavy is not much worse than Daedric but you can use those hearts on weapons instead, and so on.