At various time I've used all of those, and for awhile, 18's.
The nearest I got to having a favourite was the Electro-Voice 15's, which I used in several cabs over a 20 year period.
I started with 12's, went through 15's and 10's, now back to 12's, but the size of the driver is the least relevant part of the tone equation.
Trouser flapping doesn't necessarily make a good sound. The definition and clarity of my current 12's will clearly reach every part of the room, and that's the definition of a good speaker cab.