If you know what you want a workstation for, you probably have enough know how to get a Supermicro barebones system and stuff it with the exact CPUs, GPUs, RAM,

If you know what you want a workstation for, you probably have enough know how to get a Supermicro barebones system and stuff it with the exact CPUs, GPUs, RAM, SSDs, and ANY peripheral you want. More flexibility and cheaper. There are even outfits that will build it for you if you're feeling lazy. And when Linux breaks, there is a wealth of knowledge on how to fix it. I have found OS X's community to be plagued by the opposite.