F-16 is a proven platform. The performance could be verified by the third party, as F-16 exported to many oversea customers, Gripen also has its buyers.
F-2 is a licensed variant of F-16 with some improvements, or it’s considered as F-16 customized by Japan.
J-10 is a non proven design, no oversea buyers, the Lavi design which they told that J-10 based on, isn’t the non proven design as well.
So who can compare those ?