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Anything faster cannot output data faster than gigabit ethernet, so not needed.
If you don't have anything that can do 100MB/s then what is the next best thing ? A 16gb usb stick that can do 80MB/s is still plenty good for home assistant or nextcloud.
In this case reading is more important than write
If you can afford it, a sandisk extreme pro is really fast, but if you can't afford that, the intenso Speed Line 256GB also is fast enough, and more than half the price/GB
You can buy a cheap SATA SSD like the Samsung 860 Evo and a SATA to USB cable. This is faster and higher capacity than most USB sticks like the other answer suggests.
SanDisk Ultra Fit USB 3.1; Read speeds up to 130MB/s
amazon $8 for 32gb amazon $15 for 128gb
Other thing that comes to mind is sandisk extreme pro class 10 SDXC 16gb card, advertised around 90 MB/sec read. Not sure about being usb 2.0 or usb 3.0 though. Similar pricing.
double check with manufacturer and other credible sources on the advertised speeds.
^^ $30 sandisk 128gb SDSDXXY-128G-GN4IN transfer speeds up to 170MB/s [requires a compatible device capable of reaching such speeds, such as the SanDisk SD UHS I card reader (sold separately)]
