Depends on what kind of perks your after.
190a8 with 30 eny is a big perk farmer, along with c.202.
LVT4 to a strat or town is another winner.
Troops are normally very good, bring an M3 if your looking for GV perks.
Resupply can be good, fairly low risk.
You will get a lot more points for killing a 190 in a Seafire or spit 5 than you will a spit 8 or 9.