Lenovo vs Acer? Cant decide which to buy.., Need opinions in which model to buy

Hi,

I'm currently looking to buy a new laptop but I can't decide which one is better.. right now I have at least three laptops to compare which is Lenovo y580, Lenovo y400 and Acer aspire v3 ..

Can u guys give me your opinions on which laptop is more worth the money and which one is better? If you guys know any other better models than pls help to suggest.. thx..