I have been dealing with Wildcats for over 50 years, for many different customers and dozens of different shells. In the last 55 years or so I have probably done well over 200 different rifles in wildcat chambers.

Because of that history I have NO favorite wildcat, and if a cartridge is a wildcat, it is by it's very existence NOT a favorite.
I fact such cartridge are on the opposite end of my "favorite" list.