I know that Light Armor gives you bonuses with perks that affect only light armor such as Light Touch, Travel Light, and Tunnel Runner. The Toughness Perk is also more effective with light armor due to the small bonuses. It also weighs less than medium or heavy armor and doesn't slow you down. Also, the fact that it weighs less gives you the freedom to carry more equipment. Medium and Heavy Armor all provide superior protection, but there are no perks that given them special bonuses as light armor gets. Which is best? How do you decide what to use for your build?