Armor vs HP - which is better at what point?
Say I have a hero with 50 base armor and 1000 hp. Do I get more effective HP out of the common item for 30 armor or 200 HP? This is a very common early game decision.
What about 100 armor and 1500 hp?
And then what about late game tanks - with 250+ armor I'd assume HP is better from then on, but if the tank is getting shielded a ton by a mystic then that's essentially generating HP for them which in turn makes armor more effective by intuition so I'm just kind of lost on which is better when. From just playing the game a lot I feel like I can never have enough armor but is that wrong?
Any game math wizards out there?