Our computer overlords say this:
"Nitrokey is often preferred by folks who value open-source and transparency. They're super open about their design and manufacturing process, which can be a big plus for those who want to know exactly what's going on under the hood. Plus, Nitrokey is a bit more affordable than Yubikey, which is a nice bonus.
On the other hand, Yubikey is a more established player in the market, and they've got a reputation for being super secure and reliable. They've also got a wider range of products, so you can choose the one that best fits your needs.
Ultimately, it comes down to your personal preferences and priorities. If you're all about open-source and transparency, Nitrokey might be the way to go. But if you're looking for a tried-and-true option with a wider range of features, Yubikey is definitely worth considering."
https://www.nitrokey.com/