My favourite Heavy Armor has the be the Imperial Armor with the Imperial Full Helmet.

It really depends on the character. Then again, I diligently search through the amazing armor mods to find just the right one.

So, looking at the Vanilla armors, I'd have to go with Daedric. Followed very closely with Ebony and Plate.

Steel Plate.

Good old fashioned steel, the one with the pauldrons.

Dawngard and Nordic carved not to keen on the helm though it looks a bit like a kids entertainers teddy bear hat.

Haha .. And I'm using the Imperial Steel Armor right now.. But I've just become the leader of the Companions.. So I think I may need a new image.. A bit of a spruce up to some fancy armor.. I'm not too keen on the Wolf Armor

Orcish.