As mentioned above I'd say the over/under you tried fit you better hence the improved scores. I own and shoot primarily over/unders for all my shotgunning pursuits as they are my preferred style of shotgun but that being said I own pumps and semi's as well. Each has it's place in my different pursuits. For hunting my preference goes to my over/unders for a number of reasons the first and primary reason being safety. In a group setting such as a field hunt for waterfowl from layout blinds I like the fact that I can leave the action open with ammo in the chambers and be safe yet ready to go into action by simply closing the gun. Also my partners can see when shooting has ceased my gun is open and safe. Secondly I like the idea of having two choke choices at any given time and being able at the flick of a switch to select the barrel with the preferred choke on singles. There is also the fact that nothing is quicker for a fast follow up shot. There is no pump handle to work or wait time for an action to cycle and chances of a misfire are much reduced as there is no option for jamming or failing to eject spent cartridges. As well the shorter overall length makes for a much easier to fit in a layout blind gun and quicker shouldering and target acquisition.
For clays I shoot an over/under, single shot or combo gun 99.9% of the time and for some of the same reasons listed above especially safety(again an open and empty gun is highly visible and proven safe). There is also the ease of carry along the range and for doubles presentations a double barreled gun is much faster at the second shot and much quicker to move to the second target and get on target with. The other preference for me though not in the realm of performance is simply esthetics. They look damned good!!