My pick was Pacquiao, his run during his absolute prime was the most impressive of the 4, he was looking incredible against much better opposition.
Roy was p4p number 1 in the planet for nearly a decade when fighters like Floyd, Whitaker, DLH and Lewis were in their prime while barely losing a round in that time span.
loma's period at feather/super feather when he was making consecutive top level opponents 'no mas' was something real special
Roy was p4p when others like Floyd were in their prime nobody questioned it Tyson would be a close second, followed By manny Lol at loma