FWIW, to me it is the total time involved. Time to pack the car, unpack at the field, fly and get back home.
The Bobcat is nice because it sets on its gear That means no stand. You can put the wings on (with truly one bolt per wing, one connection with Sbus) while you are filling the main tanks. I can get a couple of flights in on my lunch hour.
The cougar might be the same I don't know.