capture card for thunderbolt 3.0
Thunderbolt is a much better connection than USB 3 for these purposes.  Thunderbolt, when fully implemented, is actually able to function as an external 4x PCI-E connector in addition to a bunch of other things.  You can use a cheap adapter that will allow a USB 3.1 connection (which is backward compatible to previous USB standards) or you can buy a new device that is Thunderbolt 3 compatible and will be able to make use of the added bandwidth that Thunderbolt 3 supports.