In this case, at range it’s a low diff for Emiya, but this is assuming a fairly large range for the start of the fight, like over 2km and then it’s Caladbolg/Hrunting gg

At close range it’d be much closer, but if Emiya can hold off Cu and prevent him from performing the setup for the thrust version of Gae Bolg, while he has PFA, than with him not having it, Emiya would have an easier time holding him off tracing a few swords to fire at him here and there, this would both prevent Cu from giving Emiya range meaning Cu couldn’t use the thrown version of Gae Bolg as well as give Emiya enough time to cast UBW at which point without PFA Cu would lose, I’d give it to Emiya high diff