Some of the unfavourable comparisons between the Swift and the Hunter, although true, are a bit unfair.
The Swift was originally purely a high-speed research aeroplane designed to explore the transonic and low supersonic handling characteristics.
The Cold War started getting even colder and as a back-up for the Hunter, Vickers was more-or-less told to turn it into a fighter - hence the gunfiring and some handling problems, the aeroplane was never originally designed to carry guns or be a fighting machine.
The Hunter, however was designed from square one as an interceptor fighter, at which it excelled.