Same thing I tell most people in your position...
Before you spend your own money, get some trigger time with various makes/models. If you don't have family/friends/co-workers with pump shotguns who will take you out to try them, look for gun clubs or ranges with rental guns. Handling different makes/models at a well-stocked firearms dealer will help some, but is no substitute for actually shooting them.
Once you get some hands-on shooting experience, you'll be in a better position to make a decision than if you only listened to advice/argument on the 'net.
Barrels interchange very easily on most modern design pumpguns, and spare barrels for popular models are common and relatively inexpensive. It's easy to put on a barrel that better suits the job at hand, no need to try and 'make do' with something that doesn't work as well as a job-specific barrel. If you insist on a one barrel do-it-all setup, a 21-23" vent rib barrel with interchangeable choke tubes and double beads is a good bet in my experience. These are often sold as 'turkey guns.'
FWIW,
lpl