Heavy armour, Skyrim's combat system doesn't look like it has much emphasis on dodging and movement speed, so you're better off being able to take a few more blows, especially since it's said you can't block when dual wielding.
You're so wrong ;p
Casters and ranged combatants kite away from you if you're slow. Unless you have a ranged attack you'll have trouble running them down. Many larger foes power attacks will knock you on your ass if you block them, or still hurt you anywa. According to early report mobility is important to any traditional warrior
But don't you get a defence bonus if you choose light armor and pick the right perks?I never liked perks like that, it sort of defeats the purpose of light and heavy armor.
Both armour sets have the same perks in that respect (+150% armour rating). Since heavy has the highest base armour rating, heavy will always have the higher armour value. (The main reason to consider lighter armour is the magic penalty and the stealth penalty that coems with armour)