I have always used Armor penetration while a lot of other people use flat attack damage runes.

I have actually no idea which one is better by statistics, so lets calculate!

Data lvl 1
Average amount of base AD for an AD carry at lvl 1 = 55
Amount of AD gain from masteries: 3 + 0,58/level = 3,58 AD at lvl 1
AD runes grant: 0,95 AD each mark and 2,25 each quint
Armor penetration runes grant: 1,28 ArP each mark and 2,56 ArP per quint

The minimum AD at the start will be 55 + 3,58 = 58,58 AD


Comparison lvl 1
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