If you don’t think it’s Mark Allen, you need to go to school. The guy could win over all distances in the same season, culminating in winning the first ITU Worlds in '89, and Kona a couple of months later. He won Kona 5x straight (6 total), 10 Nice victories. He is the Eddy Merckx of Triathlon.
On the ladies side I see it as more complex. I cannot identify a female athlete that was as versatile as Allen. PNF definitely the Queen of Kona, but Michellie Jones comes closest. She won 2x ITU Worlds, Olympic Silver and bagged a Kona win before retiring.