I wasn’t able to mark one option because my use is really dependent on several things.
I do like that the flashlight has the possibility to have a pocket clip!
Preferently, deep carry or something like that, so that the flashlight doesn’t protrude much from the pockets.
I also tend to like the “screw-in” clips , such as the ones sold in Convoy store, specially for small lights. When they don’t have that option, I try to use something that gives me similar carry options.
When I come to work, I don’t use the flashlight with the pocket clip, and also tend to avoid using the knife with it too, so that it doesn’t get spotted in the metro or in the street. I do carry them in the right pocket, though, or in the coin pocket (depending on its size).
When I go for a walk at night, I use the flashlight with the pocket clip, in the jeans/shorts pocket, or even in the jacket pocket, so that I can easily grab it and use it. Same thing goes for the knife.
When I am at my parents home (village) I tend to use it with the clip, too, as I feel I am in a more relaxed environment and I probably need it more than in my regular day-to-day “routine”.
I do like two way clips for the lights I carry in my backpack strap (Olight M1T Raider, On The Road 311), but only rarely I use them in caps.
Oh, and I do like the possibility to reverse the clips via the grooves in the flashlights!