Look at these things:
1.RAM
2.Speed of Hard Drive
3.Video card
Whichever has better parameters is the better one and if they are identical I know the Lenovo one has heating problems so go for the Acer in that case.
Does either one have a discrete graphics card or does one perhaps have more RAM than the other? those factors, as well as the speed of the hard drive may make a difference.
Look at these things:
1.RAM
2.Speed of Hard Drive
3.Video card
Whichever has better parameters is the better one and if they are identical I know the Lenovo one has heating problems so go for the Acer in that case.