In a 1v1 visual fight, the 16 and 15 should out-turn the 18. The 16 is pretty much half an F-15 and they are very closely matched. One area where the f-15 wins is in the slow fight where the F-16 flight control system starts to back off pitch input whereas the F-15 system gives you full stabilator authority.
At the back end of the F-15 RTU course our students used to go up against the F-16 Guard units and would generally either win or escape.