Well, as far as flying the Soviet hardware....
There is no better fighter in this game for a short-notice defense against a big NOE raid than the La-7. It gets airborne in a blink and accelerates so fast that you can be above 300 mph before they even realize you are present. Blow by the fighters and butcher the Goons. Then you can come back and abuse the rest.
For offensive fighter duty, I prefer the Yak-9U due its better range and general high-speed handling.
For general defense against aircraft and GVs, I like the Yak-9T for its one ping kills of soft GVs and fighters, with 2 or 3 ping kills of Buffs. I'll also fly the La-5FN as well.
When being swarmed by GVs and/or fighters, I'll take up an IL-2. It's a pig, but it's usually underestimated and those 23mm cannon are extremely lethal. I can usually get 2 or 3 of their fighters before the IL-2 is a flying sieve.... Then I just ditch it and grab another. Once in a while one sheds its tail... But what the heck, it's still a blast.
My regards,
Widewing