Should I get a lenovo G510 or Lenovo Z50-70?

I will not be gaming but heavy internet and spreadsheet use.

They seem similar specs…

http://www.amazon.co.uk/...00HR6U0KK/

http://www.very.co.uk/lenovo-z50-70-intelreg-coretrade-i7-processor-8gb-ram-1tb-hard-drive-wi-fi-156-inch-laptop-with-2gb-dedicated-graphics-black/1402686695.prd?affsrc=acquisition&aff=google&cm_mmc=google-_-Generic-_-Product+Viewers+2-3+days-_-_nTluScYt_44106199145

I can get £30 off the Z50 so we're looking at £550 v £570.

I think g510 has worse screen and graphics card… But better processor and integrated graphics card (which I'm told is more reliable when not gaming)

Let me know your views please

I will choose the first one

Lenovo G510 15.6-inch Laptop - Black (Intel Core i7-4700QM 2.4GHz, 8GB RAM, 1TB HDD, Intel Integrated Graphics, DVDRW, Windows 8.1 Home Premium): http://www.amazon.co.uk/...00HR6U0KK/