Besides Touch ID being more useful than Face ID during a pandemic, I'm also not a fan of the PWM flicker across iPhone 12 models. Depending on how paranoid you are about your eyes, this could be a deal-breaker.
I also wouldn't buy any 1st version of a product. It's getting beta tested with the public, whereas the SE is tried and proven for many years and does the job (for me at least), for $300 less to boot. Although, I'll definitely be interested in a perfected mini in the future.