Good fucking fight, this is hard.
If Kong was a little bit stronger and bigger (which we know he WILL be as evidenced by him only being a teenager who isnt fully grown) I would give him the solid majority. Why? Because yes, Spider-Man is fast, strong and intelligent but Spider-Man largely relies on his environment (walls to cling on, high reaching areas to web from, etc etc). Kong will destroy everything if he couldn't tag him, including any surfaces that he sees him on. Spidey is fast but when buildings are collapsing I just don't see Spidey handling that solo.
Kong as a teenager, MAYBE Spider-Man if he found a way to take him out fast (and I think this Kong showed he could be surprised, hes young) but if not its all over.