Slightly off topic, quick question for you guys: as someone playing a Redguard using two-handed swords, should I plan on wearing light or heavy armor? Stamina is obviously of paramount importance, but tanking is at least as important since I'd be without a shield.
Which makes more sense?
On topic: the perk trees make it pretty clear why one would choose light armor over heavy (or the other way around), and HasperoN nailed the reason why:
Light Armor gets 50% Stamina Regeneration and a 10% chance to completely avoid melee damage.
Heavy Armor receives 50% less stagger and a 10% to reflect damage.
Those are the major differences in perks.
All about what suits your playstyle more. Stealthy player w/ rapid stamina regeneration and a significant chance to totally avoid incoming damage, or more of a tank focused on staying power? Conditioning certainly doesn't make light armor worthless compared to heavy.