The "low-end" Threadripper 3960X specifications are pretty clear:
24 cores @ 3.8Ghz base clock (before OC) vs 28 cores @ 3.0Ghz base clock (4 more cores, but running at around 20% slower - not to mention a lower IPC)
88 PCIe 4.0 lanes vs 48 PCIe 3.0 lanes (WX Navi workstation cards are now available for TR. Apple? - still on Vega - in addition, TR has the ability to use Nvidia cards, if your workflow requires it.)
142.25Mb cache vs 24.75Mb cache
3200Mhz ram vs 2933Mhz ram
The ability to move to a 32 core/64 thread TR running @3.7Ghz base is yet another advantage. As is the ability to move to Zen 3 based TRs at the end of 2020 (SMT-4, hmmmm.....)
Of course, if your workflow is Ride or die with AVX-512 then Intel is still (and should be) the preferred choice.
This