Fuel in Vehicles in Storage

[GTLEGEND]

What are people's thoughts/advise on fuel levels in vehicles being stored for long periods? This is referring to both older (steel tank) and new plastic tank vehicles.

From what I have heard there are pro's and cons to both scenarios of leaving fuel in tank or leaving it almost empty when storing vehicles for longer periods.

Leaving tank full of fuel stops condensation/water from building up in the tanks and corroding fuel senders and pumps but running the risk of fuel going stale/turning jelly or even becoming like black carbon when it goes off.

Leaving tank almost empty reduces the risk of fuel going off, but then the risk of condensation/water building up inside the tank can cause other issues like corroding fuel pumps/senders etc.

Seems to be a bit of a loose loose situation.

Thoughts..