This depends on your definition of "best." If you are going for the highest stats ... then just pick the one with the highest stats. Personally, I could care less about stats and always pick the armor/clothing that suits my current RP.
Deathbrand is a Dragonborn DLC armor if I recall correctly. You have to find it in Solstheim(spelling?).
Here's info on it: http://elderscrolls.wikia.com/wiki/Deathbrand_Armor
Dragonbone are pretty good, and most of them don't look ridiculous.
Edit: http://elderscrolls.wikia.com/wiki/Weapons_(Skyrim) of all Skyrim weapons. They're separated by type and you can sort them by name, damage, weight, value, etc.
Maybe he want's to make an OP character without cheats.
In that case dragonbone weapons with two enchantments of your choice is probably the best. If you don't wanna use enchanting, one weapon I believe is among the best is Chillrend, which boasts great base damage and some really neat enchantments.
As mentioned above, there's an armor rating cap at like 80% of damage reduction which, according to UESP "occurs at 567 displayed armor rating". With smithing you can make almost any tier armors reach that with a full set.
http://www.uesp.net/wiki/Skyrim:Armor to the page.
best weapon? Miraak's Sword when obtained at level 60+
stats wise, the Dragonbone weapons are the best weapons in the game hands down, no exceptions.