there were a whole series of macbook pros from around 2010-2012 which had the nvidia discrete GPUs, BGA chips, come unsoldered from the motherboard on their own under normal usage.
Discrete GPU on my former MBP 2010 would regularly crash. Would need to force it on the integrated, slower though less power hungry Intel GPU.
Supposedly the whole Nvidia debacle is the reason why Apple hardware doesn't sport Nvidia anymore. Though you can get them to work sometimes with iGPU, its more safe to keep up with AMD.
I'm not sure about FreeSync vs Gsync though, and I suppose Moonlight doesn't work on AMD.
(edit: nvidia, not amd/ati radeon)