I don't think there's any doubt that Curry is the better player right now. With that being said, he's older, on a historically great team, and has not proven he can play in any system other than one with 3 other hall of famers. The gap isn't too large for me, and as someone said earlier, if it's for a long term point guard I am probably taking Kyrie.
Kyrie is younger, has shown his ability to play successfully in two different systems, and is stronger than Curry in a few different areas.