I can fly a FW190A8 to a fight and land 15 kills in a 30 minute sortie(which I have) because I was "shooting fish in a barrel", same fight in a KI84 and I can probably squeeze out 10(the most I've landed in single sortie for a KI84).
If I was flying for the other country who would be pretty much getting vulched, I might get lucky and get 2 kills in the A8 prior to landing, but in the KI84 I have a good chance of getting 5.
The score literally does not matter at all, it's very easy to manipulate. It's not a matter of what type of plane your in, it's what type of fight your in.
Snailman style player vs Bruv119 style player.
Snailman is in 152s all the time because he's normally fighting against strat raiders. Bruv flies Spits (because he needs the crutch

) because he normally out front in a furball fighting other spits, KIs, 109s, Dora, ect ect ect everything in a furball.
Both get a lot of kills, switch them around, neither would land very many kills at all....Spit 9 will have problems with the faster fighters at high alt, the lower fighters will chew on the clumsy 152 below 10 K.
If your talking about score, the only number that should be brought up are 1. Dueling Bracket Wins 2. Kills in special events/FSO 3. KOTH/TOC wins. With most of the better sticks in this game none of those really matter because most are just looking for the blooding pumping fight.