In the case that attack aircraft are introduced, I compiled a list for some of the factions w/ strengths+/weaknesses-
USA:Douglas Skyraider->F-4 Phantom->A-10 +large and devastating payloads, good resilience/-lower speeds(f4 is an exception), high cost.
GBR:Blackburn Buccaneer/Supermarine attacker etc->Harrier I->Harrier II +decent payloads, good speed, good resilience, good air to air ability/-High costs
FR:Various Mirage's from basic models to newer types +Cheap, good speeds/-terrible payload, low resilience, low damage
USSR:Su-7/17->Su-25->Il-102 +Cheap, good speed, reasonable payload, decent resilience/ not stellar in any aspect and not many specific advantages
GER:F-4/F-104, they didn't really have homemade products at the time so I'm not sure what to say
+good speed/payload/resilience/-high costs, not much advancement ability