Its a toss up, Delhoya is much stronger and has more experience. Floyd is very fast, but has ZERO power at 147, never mind 154. He hasnt had any sort of KO power since he fought at lightweight. Floyds defence is one of the best in boxing, but if Oscar can land a big left hook, it's game over. None of the mayweathers have been known to have strong chins.
There is one thing to be certain of though...no way can powder puff floyd knock out Oscar, he can win a UD though. Felix Trinidad, Ike Quarty, Shane Mosely couldn't KO Oscar so there is no way Floyd can.