I am planning to get an external storage for Ventoy use. My current random usb 3.1 stick writes .iso-files with only 10-15 mbps only. I found this webpage for usb stick speed comparison: https://ssd-tester.de/usb_stick_test.php
The fastest usb sticks writes 800-1000 mbps in the crystaldisk-test.
If you have personal experience on this, please recommend which approach is better.
Nvme would be much faster, I personally use the one from ugreen which is ~30€ plus a nvme with 2-3gb read/write speed for around 100€. You can find 1tb for 100€. I don’t know any good USB sticks that can do that much