What's a joke is the fastest Mac for pro apps is a 2010 Mac Pro with a GeForce GTX 1080 Ti video card. http://barefeats.com/hic2_nv_vs_vega.html
Why is it a joke? High Sierra now allows a wide range of Macs (including 2013 Mac Pros) to use eGPU boxes, which would include things like the GTX 1080 Ti or Titan Xp Pascal. Doesn't matter if you have Thunderbolt 2 or 3...there are eGPUs available that work with those.