Looking For Help Learning Powerspikes

Do any of you guys know of a resource I can use to learn the powerspikes of all the champions in lane?

And also: is there any way to know whose powerspike is bigger? For example, let's say a vlad and an irelia hit 9 at the same time. This is arguably the largest powerspike for both of them midgame. How do I know who would win an all-in? After almost three years of playing this game, I'm getting better at judging this sort of thing, but a lot of the time it feels like guesswork. How do the pros know exactly who has the advantage in lane at all times?

Is it purely first hand experience?