FIDO U2F is Next-Gen Security
The U2F standard extends FIDO authentication by providing a critical layer of security with a physical device that acts as a second factor. This is more reliable than the second factor most of us are used to where an SMS message is sent to your phone.
With this protection, it becomes much more difficult to get at your second factor because the seed key is part of the firmware of the physical device. This means that for somebody to get into your account, they would need to know your password, have your U2F key (which is presumably secured on your person or in a secure location), and even if the attacker is able to fool the computer that a U2F key is plugged (not likely), you still have to physically touch the key to activate it.