"Do you recommend the hardware password storage of Nitrokeys?": We don't use it due to its limitations.
First of all, a Nitrokey Pro can only store up to 16 passwords. Each entry is limited to 20 characters, however, non-ASCII chars count twice or even more, forcing passwords to be shorter. Usernames are limited to 32 characters. To access the password manager, you must use the Nitrokey App. The same seems to be valid for the 2018 Nitrokey Pro 2.
We use KeePass 2, and KeePassXC.
@infosechandbook that seems oddly arbitrary on their part
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