Lenovo G505 vs Lenovo Z510 what is better for gaming?

Searching for a gaming laptop that is under 600 euro (500 pounds), so far these two seemed to be quite good, question is, which is better for gaming?

http://www.amazon.co.uk/...00HWPXMVU/

OR

http://www.amazon.co.uk/...00HR6U0KU/

Ps: if you know of any good gaming pc's in amazon uk, please let me know.

Added (1). Under 500 pounds

Lenovo Z510 is best for gaming
Lenovo G505 is best for daily use or normal use

Checkout Asus X Series it great for game and under 50k INR which is und 500 pounds

Lenovo's website is having a big sale right now, so check that out before you buy from Amazon.