- GA and Zhonya's serve entirely different purposes. Stop attempting to make the comparison. One is an early game item; the other is late. One is an in combat save. The other is a Post combat save. One activates automatically. The other activates only when you remember you have it.
Furthermore, GA's component parts are far more advantageous on build up in both cost and utility than a Zhonyas. I don't know if you are aware, but
has been price bumped over time, and in comparison to scaling skills, is inferior to BF Sword.
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Maw is FAR more purchase friendly than an Hourglass.
-
Explain how. In terms of the fact AD scaling champs have 80-120% Bonus AD ratios and AP champions have 40-80% Scaling in most cases, and do not have a base AP to work off of, whereas AD champs do? Or maybe the fact AD has at least 5 different ways to permeate defenses, and the add ons to them are FAR stronger than any add-ons to any magic penetration items?
I want to look at the last thing I said:
Utility on
vs Utility on

O Right.... two of those mage items are actually the same item, and the Penetration on them is accompanied by almost NO UTILITY AT ALL (with the exception of a 3000g Grievous wounds, vs an 800/900 for AD/tanks)
The Lethality items: Eliminate wards, added on hit damage, out of combat move speed, active move speed % bonus boost, and a potential nulling shield.
Win: I'd have to give this to the AD items in a landslide.
vs
Oh right...... this is a 1 sided field of penetration that only one champ class actually gets, other than about 2 AP champions (
) And mages don't even get to USE Wit's End, or Guinsoo's, so in reality this is a group of 3 on hit items for ADs for the most part.
Win: I'd give it to AD's in a landslide.
vs 
Pretty flat items with no utility, other than THE AD ITEM HAS A 800G GRIEVOUS WOUNDS COMPONENT. Oh..... and the fact that AD components actually give Penetration BEFORE they are fully built, where AP doesn't until it's complete.
Oh wait there's more:
Conqueror (Sucks to lose out mages)
Infinity Edge (Going to be reverted but still offered a fifth way to bypass defense)
We can even get into a list of what champs actually have a form of penetration:
AD

ALL have on board Penetration or some form of very strong true damage in a single chunk which mitigates defenses.
AP

Oh Wait....... that's about IT.
P.S. Pantheon has 360% Bonus AD scaling on his E, so you're really climbing and reaching if you want to counter with "AP get more raw AP points" None of them have scaling like THAT.