If I am flying at GameRanger, or flying a single mission for sheer enjoyment then to me variety is the key.
I just flew a few this morning. The last one was a truck interdiction in the Little BoB theatre thay I am upgrading.
Approaching the target the Luftwaffe came at us head on, and I was able to take one of their aircraft out right then and continue to the target.
When I got there I destroyed a number of trucks.
Having spotted railway lines near the truck convoy I found a train and destroyed it, headed down the track and found another one which I destroyed as well.
Then I asked for a vector to the nearest enemy aircraft and headed after them.
They had been given a hard time by out AIs, but a handful were left, of which I downed two before running out of ammo.
The Little BoB theatre that I was testing has plenty of railway lines on its 148x95 tilemap, so you are rarely too far from one. When you are familiar with the theatre you know where they are and can head off to the nearest one. Some run E-W close to the coast, so it is a matter of heading North.
The exe that I was also testing is very efficient at generating trains
So I got three enemy aircraft, five trucks and two locomotives. It involved dogfighting and strafing, so there was plenty of variety.
In the near future I will release the updated "Little BoB" theatre, and the new exes.