Imo, at the moment it is PAc. Pac seems to control the pace of a fight-with the exception of the JMM fights, and even then at times he controlled the pace. Floyd is second imo.
JuanMA and Wlad are also up there as is Valero, Izzy Vasquez, Urango, Hatton(when he was still relevant) Hopkins, Calzaghe before he retired, and Vitali. A case can be made for Adamek, Abraham in the opposite direction lol, and even Glencoffe Johnson.
I would have picked him, but the level of opposition just plain sucks, Hopkins makes other elite fighters fight his fight.