Bit of an old thread, but I'll put in my two cents.
As others have said, what's more important than anything else is if the gun fits you. Choke selection, barrel length, trigger type, rib style, bead color... These are all secondary, and with enough practice, you can make anything work for you, and work well.
I was in a similar situation not long ago, looking for an O/U that I could use for trap, skeet, and 5 stand. In the end I chose a Citori CX, in 32", with the adjustable comb. I had had the opportunity to shoot a CX in 30", and I found it had been a very natural fit, once I got the adjustable comb set to my dimensions (I need fairly low combs).
I had talked with many people, and they had recommended the CXS in 30", but I chose a CX in 32" for the following reasons:
I prefered the raised rib style of the CX, which allowed for a more upright and open view of the field, which felt better to me.
The difference between a 30" and 32" is not as significant as some people make it seem. For starters, one gun in a 28" may swing just as well as another in 32", so raw numbers really don't tell you anything. To recommend a specific length with absolutely no other information would be like recommending a choke size before the person tells you what sport they're shooting... It's absolutely dependent on the gun specifics, and furthermore, on the shooter's biomechanics (arm length, how they hold the gun, stance, etc).
So really to compare, you need to be apples to apples and contrasting across the same model, right?
And finally, the "pointability" of the 32" felt better in my hands; out in the field, it is stable and very smooth, it just feels like it "locks on" to targets, both in trap and skeet, thanks to the additional sight radius... Not to mention that if you really want to keep the "swingability" of a 30" with the benefits of the 32", you can just swap out the steel chokes for titanium ones. I've done the actual math, and swapping these out will get you to exactly the same overall weight, center of gravity, and moment of inertia as a 30" on a 32", to the point that no person alive could tell them apart with a blindfold!