Which is better? Lenovo a7-50 or asus me175cg?

Lenovo a7-50 is better for you. Bcz it is best for this time. And with high configuration.

Don't' buy anything w/o reading CR.
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http://www.consumerreports.org/cro/about
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http://www.consumerreports.org/cro/how-w%C3%A2%C2%80%C2%A6
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"Consumer Reports is a nonprofit, expert, independent organization" that tests a wide range of products and services in detail and publishes the results in a monthly mag avail @ many bookstores and website; fee for full access