Compared to the new Yubikey with FW v. 5.7, for me the advantages of the newest Token2 keys ('Release 2') are the higher number of passkey slots (300) and, specific to the key I bought, the dual USB-A/USB-C design. The latter is useful to me as I will sometimes need to use the key on computers that are still stuck on USB-A-only.
I took some photos of the Token2 Dual and my Yubikey Security Key side-by-side:
https://drive.proton.me/urls/5J5Y4AJYZ4#ztMh8qFuan7D
https://drive.proton.me/urls/Y4YD95XGKR#szApWRA545wP
Here's a brief comparison:
The Token 2 key (only 'Release 2', mind) can store 300 passkeys, compared to my Yubikey FW v. 5,4 which can store 25.
The Token2 Dual key is slightly bulkier, but not by much.
The plastic on the Token2 key feels a tad cheaper to me. The plastic appears to consist of two parts that are glued together. I wonder how strong that glue is, and how easily it degrades. Token2 advertises the key as being durable against water ingress*. I wouldn't have bought the key otherwise, because it rains quite a lot where I currently live. And I plan to keep one of the keys on my keychain. Time will tell.
The keyhole is placed right at the edge of the key, and is tinier than the Yubikey's keyhole. It fits with my keychain, although I'm wondering how easily the plastic around it will degrade over time when used with a metal keychain. After just a few hours being attached to my keychain, the plastic is already showing slight marks (not visible in the photo; it was taken shortly after unpacking the key). The Yubikey feels like a better design; I've had it on my keychain for two years and it's not showing signs of wear. The Yubikey's keyhole is also coated with some metal.
The Token2 USB-C version has a larger keyhole, placed a bit more away from the key's edge. I would prefer this design on the Dual key as well. It would create a longer key than the Yubikey, and I assume Token2 thought that might not look as appealing. Although I wouldn't mind.
User verification is achieved by touching the golden coating on the sides of the key. Briefly touching one of them is enough, and you don't have to pinch or press them. This works reliably. At first, I didn't notice the golden coating, and assumed I had to tap the top and/or bottom of the key. So I started tapping them like a wild person, inwardly cursing myself for buying a useless product. Until I actually looked at the key's sides. 😄
Token2 advertises that the key has a lifetime of at least 10 years. I doubt I will keep a security key for that long, although the high number of passkey slots does increase its potential longevity. That is, assuming that passkeys are successful and get rolled out by most services out there. I'm really hoping they will be.
I think I'm likely to keep the Token2 keys and use them as my main keys instead of my current Yubikeys. I'll keep one on my keychain and the other plugged into my computer for convenience. If the keys prove durable to water, I might buy the USB-C version and keep it off-house as a backup key.
*Complete quote:
This model is featuring a specialized PCB (Printed Circuit Board) coating for enhanced water resistance. This protective coating ensures durability against water ingress!
Edit:
troika I think you might have posted in the wrong topic; these keys are not sold by Google. Token2 is a small Swiss company. If you have substantive arguments to support your claim (which I'm currently not seeing that you have provided), I suggest you make a new topic.