the more the better. When it comes to a real war, hi tech can only go so far.
There are about 190 F-22s. They no longer manufacture them. Parts are salvaged off other F-22s. The US is upping their F15-EX production and F16s.
F-35s are not proven yet.
Stealth fighters like J20s and such are good to have. Great for strategic stuff but when a real war starts, you need volume and ease of manufacture.
The amount of China's fighter planes is pale in comparison to US's.
https://en.wikipedia.org/wiki/List_of_active_United_States_military_aircraft
https://en.wikipedia.org/wiki/List_of_active_People%27s_Liberation_Army_aircraft