"nvidia-modeset_load="YES" is an official nvidia driver for the new(er) generation of Nvidia's GPU(s).
modeset allows the GPU to auto detect your screen/monitor capabilities - resolution, refresh rate, etc.
"nvidia_load="YES" is an official nvidia driver for the older generation of Nvidia's GPU(S)
So, use one that supports your GPU.
In my case:
dmesg | grep nvidia
nvidia-modeset: Loading NVIDIA Kernel Mode Setting Driver for UNIX platforms 390.87 Tue Aug 21 15:53:31 PDT 2018
nvidia0: <GeForce GTX 960> on vgapci0