I've used Kanguru in the past but haven't really looked at USB drives since switching to IODD external SSDs. You might also look specifically for "Windows To G

I've used Kanguru in the past but haven't really looked at USB drives since switching to IODD external SSDs. You might also look specifically for "Windows To Go Certified" flash drives - not because you're actually going to run Windows from them but because they should meet some decent minimums for speed and flash endurance.