What is the strongest 2FA?

When it comes to enhancing the security of cryptocurrency accounts and financial transactions, two-factor authentication (2FA) is a crucial measure. But with so many options available, it's natural to wonder: what is the strongest 2FA method? Some argue that hardware-based 2FA, such as physical security keys, offers the highest level of protection as they are nearly impossible to replicate or hack. Others prefer software-based 2FA, which can be easily set up and used on multiple devices. However, it's important to note that the strength of 2FA also depends on the specific implementation and the security practices of the user. What do you think is the strongest 2FA method, and why?