If you just wanna grind F-4S is the only way. If you wanna have a fun and grind F-20 is the way.
That one’s funny.
See the former is for bots and the latter for the newbies that get baited into “more expensive more better”.
It’s still the F-5C that can do it all, at the same time having poor enough stats so that gaijin doesn’t balance it or brings the engine exhaust temps up to their real values lololol