Hard to call. De La Hoya was pretty beastly at 140 and Taylor wasn't exactly the hardest to hit. On the other hand Taylor would have been by far the best opponent he faced at the weight and Oscar never defeated anybody with superior handspeed.
Yeah, its really tough call either way. I wanna say Mel, but truthfully, my head says Oscar KOs Taylor late while down on the cards.
I would pick DLH by late-round TKO @ 140 in a very competitive brawl. I would pick DLH by mid-to-late round TKO @ WW & 154 (welter being the competitive one and 154 is a blowout) even though you didn't ask for that
I lean towards Oscar as I think he would land too many left hooks, and he has a sizeable edge in height/reach. Taylor had amazing handspeed and workrate, and would win rounds that way. But ultimately I think he’s going to be taking too many shots. He did have a better workrate than Mosley, but Mosley was naturally bigger, ranger, hit harder, and had a better chin.