matched high MV Cannons for me, as in the Typhoon/Tempest/Hurri iiC etc.
the destructive power of a cannon gives a far higher probability of critical damage if you hit with a snapshot or deflection shot, having matched weapons with matched ballistics will be preffered to mixed cannon / MG setups like the 109 or Spit!
how many aircraft limped home with MG damage compared to cannon damage? I would wager the difference was substantial!