If I may...
If you took a GR9 in a ‘two bag’ fit with 11.7 on crew in (broadly SOP) and a full (internal obvs) F-35B - and subjected them to the same taxy, ATC, weather, there with 2 x 500lb weapons, back without and a sensible recovery fuel - the answer for a Hi-Hi-Hi profile is ‘about the same’ with the F-35 winning by a nose.