Which one do I pick? I need marks (red), btw. Or is armor pen better?
If you're building a straight AP Eve then you want Magic Pen. If you lean towards Hybrid/AD then get Armor Pen.
I go Force runes for seals and glyphs, and armor pen for marks. It balances out well.
Which one of her attacks does armor pen?
Typically eves get lich bane, and that proc would be attack damage. Because of that, and the fact that armor pen is stronger than magic pen on marks, I would go armor pen.
If you're playing eve.. don't. She's really easily countered unless you're a genius at her. I suggest shaco or twitch if you like invisibility.
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