Yeah, my biggest gripe, setting up Nvidia, now, is that Nvidia's OpenGL 
drivers overwrite Intel's OpenGL drivers, meaning if you have dual GPU's, 
you get no OpenGL acceleration on the integrated (Intel) GPU.
Currently, I'm tinkering with using Nvidia's installer to install their 
drivers to another directory, and point to them in an xorg conf file 
specific to Optimus settings. Using their kernel module seems to break 
xorg's server in Void, though (which makes it unusable- the screen flashes, 
and there's no way to get to the CLI), so my next attempt is to use their 
drivers with Void's nvidia-dkms package. Other wise, between xorg conf 
files specific to each GPU, and lightdm's conf, I'm able to switch between 
an Optimus setup and an Intel standalone setup. I should be able to get 
this working, it's just going to take some trial and error. This is on an 
Aorus X3+.

And getting either AMD or Nvidia, with dual graphics, on the MacBook Pro, 
is ALWAYS a pain in the arse, but that has nothing to do with either AMD or 
Nvidia, and everything to do with Apple. In any case, GPU setup in Linux is 
typically work, and more work than getting other things configured (save 
for, maybe, trackpads, sometimes).