i stopped playing Nether for H1Z1 a few months ago. I have 1000+ hours of nether and currently 450 hours on H1Z1. Nether was good and had high expectations a year ago but what is left is about 3 servers which hold a player base of about 40 people on at a time, out of those 40 are 10 cheaters. Nether is completely dead and full of empty promises, there has been no updates for months!! Nether looks pretty yes, that is all it has to offer, that and its nice gun play. but you will realize soon nether has very few limited things to actually do. this was the reason i left.
i got H1Z1 hoping it would work from Nethers mistakes and so far it seems to have high hopes but obviously still isn't finished yet. looking at how Planetside 2 worked out which was made by the same people working on H1Z1 right now, i would say H1Z1 will be the best game in my opinion. i have some PVP videos of both games on YouTube here.