Having built 3 high end Intel hacks lately. I can't say enough about this motherboard

https://www.amazon.com/Z390-DESIGNARE-Gigabyte-Thunderbolt-Motherboard/

Thunderbolt 3 included on-board as well as voltage adjustable USB3 for DACs etc.

Followed this guide and had the easiest install ever. This combination of board/processor definitely lives up to the "Golden Build" title from TonyMac

https://www.tonymacx86.com/threads/success-gigabyte-designare-z390-thunderbolt-3-i7-9700k-amd-rx-580.267551/page-1133#post-2046300

I built mine with I9-9900k and my team loves them. They live in Adobe products and haven't had much trouble at all aside from 1 maybe 2 crashes in months with huge files (but that's just Adobe products).

I also used AMD RX580s since we don't need all that power for Photoshop. Like others have said, Nvidia does not work with Catalina so stick with the best AMD graphics card(s) you can get.