Originally Posted by nightrider_saulat
J-8 & J-7 both are interceptors, difference is:
J-8 is a double engine high altitude interceptor for bombers & spy planes which fly at higher altitudes where J-7 could not reach.
If you look at the pic, the shape nearly seems that of a J-7 interceptor, just having two engines, intakes on the side as a large radar was needed on it & large airframe.
While J-7, single engined, light interceptor.
JH-7A is designed for ground attack missions, so it may be bad at dog fights.
J-7 latest versions may win at lower altitude as its small & would be more maneuverable. But J-8 may not suck too as it has nearly the same designed body structure as J-7.
JH-7A not built for dog fights.