If the priority is performance, Intel is simply superior to AMD processors at the moment, and have been for some time. On top of that, they're much more power efficient. The 8350, which is the highest end AMD processor worth considering (the 9xxx models are simply heavily OC'd, which you can just do yourself), was released way back in 2012, and even back then wasn't really performance competitive with the higher end Intel CPUs.
Having said all that, AMD processors can handle workstation tasks, they'll do the job and they are cheaper to boot, so if you're interesting in putting a budget workstation together they can be an okay choice. But when most people put a workstation together they want the best performance possible, and in that...