Ignoring market share for a moment.. lets pretend you are looking for a job.. In no particular order

- (1) Intel, (2) NV, (3) AMD
Intel is the slow and steady wins the race - a safe bet.
NV - a bit more risky, in a more challenging economic position, but pushing the GPU-power-per-watt envelope.
AMD.. hmm.. just laid off a whole boatload of people, competing against Intel and ARM in the CPU market, and competing against Intel and NV in the GPU market..
Intel CPUs are just outright crushing AMDs offerings, leaving AMD in the low-end CPU/APU market.. in the Discrete GPU Market its tough for both NV and AMD - Intel is slowly strangling the PCIe links to them.
I don't work for any of the three, btw.