THey both suck.
We need someone new
neither of them suck, it's just fanboys getting their feelings hurt. neither of them is biased towards anything, both of them release empirical data, sometimes NXGamer misses some details, sometimes DF misses some details, sometimes VG Tech misses some details, and sometimes all of them miss details (Dark Souls Remastered using CBR comes to mind).
with the increasing complexity of how games present their final image, with different forms of temporal antialiasing, different forms of temporal reconstruction, dynamic resolutions, different modes, it's just human to not get everything right.
this isn't the PS360 era anymore where every game has 1 mode, is rendered at a static native resolution with easily identifiable settings and basic antialiasing (FXAA, MSAA etc)
we don't need somone new, we need NX Gamer, we need DF, and we need VG Tech and we need as many sources as possible, because if one of them misses a detail, it's more and more likely that someone else will notice said detail, the more people do tech analysis of games. and as a whole all of them combined will give us a clearer picture.