The 4 ‘O’Clock position seems the most sensible for me, when I finally get to that point.
As are most things, I suppose, it is a compromise. Easy draw without muzzle sweeping yourself easy to conceal with a jacket unbuttoned which the more forward options don’t have. The drawback is the seated position, especially in an auto wearing (the required) seatbelt. This locks your weapon under your seat belt. My solution is when I get in my truck I unholster (carefully) and actually sit with my pistol under my left thigh. Easy to get to, I can feel where it is. The down side (ht Ayoob) is if you get into an accident like that a loose firearm can squirt anywhere and be unfindable and officers have lost their lives in just that way. I suppose if you were in an accident you might have the presence of mind to push down hard on the pistol so it can’t get away and keep it under your butt in that way.