I have to go with Benitez. Bomber only really beat solid domestic and European opposition at 154. His bigger wins at that time (Holmes and Seys), come in non title over the 154lbs limit match ups. Benitez was beating world class opposition at 154. Benitez by close but unanimous decision; 9 rounds to 6.
With Wilfred having come up to 154 and Herol on his way to 160lb i think Herol has that additional strengh to impose himself if only sleightly on Wilfred, perhaps in the later rounds when a bit of fatigue creeps in, I dont recall Herol ever being stretched at 154, albeit lower opporsition than Wilfred, i lean to Herol close but clear on points, that little bit of late fight aggression can swing it.