Barrel length causes alot of controversy as alot of opinons are based on old traditions which as we all know do not die easily.
My advice is if you like the gun and it fits you well, the barrel length you will become acustom to for the most part depending on what particlar type of shooting your doing. My advice is based on the following.
Since shotguns became popular in the age of black powder, the longer barrel length necessary in ensuring complete burning of the black powder before the shot exited the barrel, thus acheiving the maximum velocity from the charge of powder. Black powder needed at least 30" of barrel to make efficient use of the powder. Modern smokeless powders however have given there maximum efficiency by the 18" mark.
Of course the average shooter at the time was unaware of this fact. He just new he had at least a 30" barrel and often 32"/34" in a 12 ga. As the transition from black powder to smokeless was not over night. Shooters buying new modern shotguns which used smokeless powder by tradition were used to long barrelled guns.
And it was and still is in some cases an traditional established fact that long barrels were an obsloute necessity and the longer the better when shooting at long ranges so you could really hammer those geese.
So gun manufacturers continued with longer barrels as there customers and tradition demanded it.
In fact they were not, and the fella with the 34" barrel could shoot exactly 4" farther than the fella with the 30", as his choke (end of barrel ) was 4" closer to the goose.
The second difference which is still in play to-day is swing speed, most importantly at short ranges. That short barrel 26" OU just plane swings quicker onto target than the same OU with a 32".
At longer ranges when a slower smoother swing is the norm the 32" OU is going to feel better to the averge shooter.
If you want to do a little experiment in you living room. Go get your wifes vacum pipes. Pretend one section of pipe is the shot gun and point it as various objects, now keep adding pipe sections and pretending. You'll see what I mean.
Short barrels tend to be quick and whippy, long ones slower and smooth. The shooters skill and what he therefore feels comfortable with and can adapt to will determine more than anything the barrel length he is ultimately happy with.
More Tradition;
Look on the box flap of a box of store bought shells and you still may still may see the designation "Drams Equiv" it will give a numerical figure of 2 3/4 - 3 - 3 1/4. This was actually telling you the velocity to expect from the load. You will also notice a "OZ" designation which was ounce weight of lead shot in each shell.
In the old black powder days a shot gun shell with 3 drams of black powder behind 1 1/4 oz of lead shot would produce a velocity of approx 1250 ft per sec. A good maximum hunting load was 3 1/4 which is about 1330 ft per sec. If it's marked "max load", same thing 1330.
This whole shotshell box marking system was carry over from the black powder erra. Mainly because the hunters and shooters needed something on the box that they could relate to and understand. This tradition carried on well into the smokeless age despite the fact it was meaning less to most shooters by then.
But as I said in the begining old traditions die hard. I hope all this is informative and of some help