Which is better laptop in Acer V5 472p & Lenovo Flex 14?

Acer v5 is coming with 3rd generation i3 but i get flex come with 4th generation i3 and i5 as well.
acer has no graphics card option but flex provide graphics card aswell spending some extra money

but the surround sound and superb display quality is bounding me to attract towards acer. Its color are really good. Though flex provide 300* tilt option.

but beside this fact i want to know which machine will be good as long term uses and reliability.
and which 1 will deliver over all good performance and user interface.
Which is better laptop in Acer V5 472p Lenovo Flex 14

Any body can give me more appropriate answer?

Lenovo Ideapad Flex 14

Acer