Best 12AU7?

1. I don’t think the original question can be answered considering the number of tubes available and the equipment that uses them.

2. My personal preferences are European tubes from the 1950s (in my tube components). A second mortgage would be appropriate here, especially since the Ukraine invasion.

If you have not tried the Horizon tubes by psvane, you are missing out. My Mac has never sounded better. 

Telefunken the best. ECC83 the only way to roll for me.