Smartcards and tokens

[sivmu]

Hi,

recently I came across the toptic of hardware tokens for pgp keys and I
am thinking about getting one myself.
From what I have found so far there are several candidates such as the
Openpgp smartcard, Yubikey and Nitrokey USB tokens.

One question remaining is what is the difference between the openpgp
smartcard and the USB based tokens.
Also how much would you trust those vendors and can the use of such
tokens actually decrease security?

Any advise would be welcome

Regards,
sivmu

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