A question about Attack Damage red and Armor Pen Red, which is better?
Whats the trade of for running flat AD, doesn't it decrease your damage mid game. Whats the advantage of armor pen, does it increase your damage later on in the laning phase or is just inferior to AD red in all phases?
I think that if your champion has good AD ratios to their abilities, then AD runes are better because they add damage to your skills as well as your attacks. If your champion has AP ratios or no ratios on their abilities, i.e. Tristana, Master Yi, etc., then you should get Armor Penetration runes instead.