Clearly this is a tongue-in-cheek thread, but if there's any seriousness to it at all, I can only say, mission comes first. My little O-360 180hp/CS P172D is a great little airplane, and of all the airplanes I've owned and flown, I do like it the best. But if I were to list the pros and cons of each, i.e., which wins each category, again depending on the mission, it would go something like this:
Fuel burn per hour: 172, <10 gph vs. >12 gph
Control pressures: 172, hands down
Pleasant to fly: 172, combination of light control pressures and stability
Ease of ground handling by hand, 172, because it's lighter
Maintenance costs, 172, slightly, because it's a 4 rather than a 6
Speed: 182, 130 knots vs. 115 knots
Load carrying: 182, 4 adults with full tanks vs. 3 adults with full tanks
Stability in turbulence: 182, somewhat, but with heavy control pressures
Range: 182, although both have greater range than my bladder
High altitude capability, 182
On the other hand, I don't have any country singer's mug painted on my airplane's tail--not sure if that would help or hinder.
Cary