The Unified Armor Theory

Much like physicist have had little success with developing an unified field theory I 'm not holding my breathe on this one. At any rate three are effectively three or more systems of armor in game. First there is essentially ablative armor as hit points: defense suits and screens that simply function as added hit points. SECONDLY there is the target penetration number of the AD vehicle combat rules where the amount of dice of damage done to a vehicle is added to 2d10 and if the number is high enough then damage penetrates or hurts the vehicle. THIRDLY there is the system for space suit armor which is non ablative and simply has percentages of damage stopped upto and including 100% for some weapons. On top of that there is a few odd items in the SFman like flak vests and power armor all doing their own thing. So ... in the interest of the KISS rule what might we do for a unified armor rule? My gut feeling is the rules for personal defenses are the most commonly used and most familiar to the widest audience in our fan society so they could be a good place to start. However thinking about how real world armored vehicles function where the armor may deflect 10 hits completely or one shot could penetrate and slag the whole vehicle and crew, there may be a value to keeping the target penetration number of the vehicle combat system. I definitely think that space suit armor should be brought into line with either ablative or target penetration number systems. To me is seems the least like the rest of the AD rules.