I kinda like both ends of the spectrum.
490R or 57 classic in the neck position sounds lovely to my ears; has that low break up growl that I really like. 7.5k in the neck is enough to drive amps as far as I wanna go.
An Angus Young Gibson (11k ish?) pickup or a 498T (13k ish?) or even the Bare Knuckle Nailbomb (15.5k ish?) all sound really nice, just with different characteristics. 11k easily drives an amp hard from the bridge position, imho.
But, Robert does like more gain from his pickups, as he says; that can sound great too.
Regarding Messas - I love these amps - I tried a low output tele (6.5k ish pups) in Bangkok recently, and the big Messa I was playing through sounded great; you could get lovely driven tones from those weedy little pickups!