This is a comparison of the YubiKey 5C NFC currently available for $55 https://smile.amazon.com /gp/product/B08DHL1YDL/ and Feitian ePass K40 is currently available for $26 https://smile.amazon.com/gp/product/B089ZYVCV6/Yubikey has better software, thinner (see e.g. SmartCard PIV etc.) Feitian ePass, on the other hand, has gaudy software (Windows only, see screenshot), sparse documentation, and a subset of features that Yubikey has. However, Feitian only costs half! If you want FIDO and FIDO U2F backup your regular online accounts like Google, LastPass, 1Password, Facebook, Dropbox etc. then Feitian is awesome. In terms of security checks, since Google uses Feitian and Yubikey as its own providers of Titan security keys, there's a reasonable assumption that these two companies have broken through Google's strict security barrier.
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