***Before downrating, please actually READ the guide and judge it based on it's face value. This is NOT a guide talking about masteries, passives, items, etc...simply RUNES! Thank you and enjoy the guide! ^_^***

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So the question repeatedly comes up, "Which is better for early game damage? Flat AD, or Armor Pen?" I took the liberty of doing the math to make life a little easier for everyone else out there. For those who don't enjoy the tedium of math, feel free to jump to the BOLD sections for the key points! As of the current game mechanics, Armor is calculated as such:

*Damage multiplier = 100 / (100 + Armor) if Armor ≥ 0*

For simplicity's sake, I won't be touching on the Armor Pen calculations since we are only factoring in Armor Pen runes, and not items which may include % reduction and the like. We will also not be considering masteries which could also have a significant effect since we are simply testing ONLY runes.

I decided to pit two potential matchups, Twitch and Graves against one another factoring in their base stats at lvl 1, assuming Twitch is doing the attacking and Graves is taking the damage. We will also assume that the runes are used to their maximum effectiveness (meaning armor runes will only count for the 9 seals, and AD and Armor Pen will be used for the marks and quints in each scenario)

**Scenario #1: Going with Armor Pen**

9 marks x 1.28 AP per rune = 11.52 AP from marks

3 quints x 2.56 AP per quint = 7.68 AP from quints

Total = 19.2 AP

Graves starts with 15 base Armor

9 seals x 1.41 Armor per rune = 12.69 Armor from seals

Total = 27.69 Armor @ lvl 1

When you subtract the AP from Grave's starting armor, we get this equation:

27.69 - 19.2 = 8.49 Armor

Using the armor formula and what we know, we can calculate the following:

100 / (100 + 8.49) = .92 or 92% incoming damage or 8% damage reduction (depending on how you want to look at it!)

Twitch starts with 49 AD

49 * 0.08 = 3.92 damage mitigated by Grave's armor

49 - 3.92 = 45.08 damage

So going full AP marks and quints will yield *45.08 damage* on Graves at lvl 1 per autoattack!

__Scenario #2: Going with AD__

9 marks x 0.95 AD per rune = 8.55 AD from marks

3 quints x 2.25 AD per quint = 6.75 AD from quints

Twitch's base AD = 49

Total = 64.3 AD @ lvl 1

Graves starts with 15 base Armor

9 seals x 1.41 Armor per rune = 12.69 Armor from seals

Total = 27.69 Armor @ lvl 1

Since no AP is being considered, we proceed with the armor calculation:

100 / (100 + 27.69) = .78 or 78% incoming damage or 22% damage reduction (again, depending on how you wish to view it)

64.3 * 0.22 = 14.146 damage mitigated by Grave's Armor

64.3 - 14.146 = 50.154 total damage per hit @ lvl 1!

So going full AD marks and quints will yield *50.154 damage* on Graves at lvl 1 per autoattack!

__Conclusion__

All things being held constant and only factoring in champions stats at lvl 1 with their rune selection, *Attack Damage runes out perform Armor Penetration runes early game!* Feel free to use this guide when deciding on your rune choices and if there's enough feedback I'd be happy to make additional guides comparing late-game impact of rune choices, AP values, and more! Thanks for taking the time to view my guide and don't forgot to thumbs-up if you feel that this may be of help to others! Best of luck with your games and may your penta-kills be numerous!

*Thank you to the summoners at Leagueoflegends.wikia.com for providing the statistical figures!*