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.
Titan Gray Samsung BAR Plus 256GB USB 3.1 Flash Drive (MUF-256BE4/AM) with Up to 400MB/s Transfer Speed
69 Review
Compact and Convenient: SanDisk Cruzer Fit USB 32GB Flash Drive (SDCZ33-032G-A11)
66 Review
Kingston DataTraveler SE9 32GB USB 2.0 Flash Drive for Reliable Data Storage (DTSE9H/32GBZ)
69 Review
Samsung BAR Plus 128GB USB 3.1 Flash Drive - 400MB/s - Champagne Silver (MUF-128BE3/AM)
65 Review
18 TB External HDD Western Digital WD Elements Desktop, USB 3.0, black
95 Review
π Seagate Expansion 3TB Portable USB 3.0 External Hard Drive (STEA3000400) in Black
60 Review
2 TB External HDD Western Digital WD Elements Portable (WDBU), USB 3.0, black
84 Review
π Seagate Backup Plus Slim STHN2000400 2TB Portable Hard Drive - Black: Your Reliable External Storage Solution
93 Review