A humble engineer here. I like to see position lights on at all times when the aircraft is on the apron and powered. My gut feeling entirely unsupported by any evidence, is that just maybe it might avert a tip or tail collision with those ground vehicles which seem magnetically drawn to collide with aircraft.
A single wingtip repair is worth a lot of bulbs! Furthermore I am the guy who changes your bulbs, and fixes your wingtips! I know which I prefer.
The simplest way is to leave lights on permanently.