This I program before any flight, focusing on the shot aircraft visibility. In many flights I have found the weather setting building storms to be my universal preference. Sometimes when FLYiNG SOW & SLOW the contrast between subject & background becomes lost. Some examples in a Lysander at USAAF Earls Colne 1944 scenery, FS 2004:
Weather: Building Storms (visibility: 20 miles / 32 Km)
Here it's background details that get drowned in details. Compare below, with reduced visibility the B-26's & military vehicles are more present.
Weather Custom Visibility: 3 miles (4.8 Km)
Weather: Clear Day (visibility: unlimited)
One Lysander Wheel is rolling on the horizon
Weather: Building Storms (visibility: 20 miles / 32 Km)
The Wheel has separated from distance; but with NO HORiZON (below shot), the Lysander is really flying
Weather Custom Visibility: 3 miles (4.8 Km)
Some times objects on the ground are interesting, but the aircraft looses background contrast.
So I decrease Weather Custom Visibility to 3/4 of a mile (1.2 Km) to separate the Lysander from the ground, to "give her air"