Great discussion. I'll just chime in a pennies worth on one point. The great benefit of the trigger snaps on the end of the strap is that you don't have to fiddle around with a buckle behind your back to put your sporran on or take it off. Working in an office environment or around the house where I'll put a sporran on/off frequently while coming and going it's nice to be able to throw the strap around my waist and clip and go. No question if it's in the correct hole and no buckling on the side then turning the strap to put the buckle in the back.

It's absolutely preference though.