Nvidia or amd, hp or lenovo

Notebookcheck.net ranks the R9 375m below the 940m based on their benchmark results, but their results are somewhat mixed depending on the game.

http/www.notebookcheck.net/AMD-Radeon-R9-M375.142636.0.html
http/www.notebookcheck.net/Computer-Games-on-Laptop-Graphics-Cards.13849.0.html?type=&sort=&deskornote=0&or=0&search=&month=&benchmark_values=&gpubenchmarks=0&professional=0&archive=1&dx=0&multiplegpus=0&showClassDescription=0&itemselect_6159=6159&itemselect_6286=6286&condensed=0&showCount=0&showBars=0&showPercent=0&gameselect%5B%5D=336&gameselect%5B%5D=332&gameselect%5B%5D=334&gameselect%5B%5D=329&gameselect%5B%5D=324&gameselect%5B%5D=322&gameselect%5B%5D=316&gameselect%5B%5D=314&gameselect%5B%5D=312&gameselect%5B%5D=310&gameselect%5B%5D=308&gameselect%5B%5D=299&gameselect%5B%5D=297&gameselect%5B%5D=293&gameselect%5B%5D=279&gameselect%5B%5D=277&gameselect%5B%5D=263&gameselect%5B%5D=249&gameselect%5B%5D=225&gameselect%5B%5D=217&gameselect%5B%5D=214&gameselect%5B%5D=208&gameselect%5B%5D=204&gpu_fullname=1&codename=0&architecture=0&pixelshaders=0&vertexshaders=0&corespeed=0&shaderspeed=0&boostspeed=0&memoryspeed=0&memorybus=0&memorytype=0&directx=0&opengl=0&technology=0&daysold=0

As for build quality, durability, etc, that is hard to say.

The 2nd link I provided has some game benchmarks.

Benchmark shows that overall the 940m is a bit more powerful. I have no idea about power consumption for those GPUs.