How about Lenovo Y50 and Asus G56JR. Which one is better? And please explain in details if you can?

An unqualified "better" is meaningless. If you want to know which would be "better" for you, you would have to write down what is important to you, then you can see how each does on those things, and then you can decide which one is "better" for you.

For those two, one will be "better" for some people and the other will be "better" for others.