Al Case

I'm looking at Wad Wizard and Patternmaster choke tubes. I hunt pheasants, geese and ducks....mostly pass shooting for geese. I know very little about chokes. Also, I bought a 26 inch barrel, because the Gander Mtn. gun manager told me that there was no difference between it and the 28 inch barrel. Is that correct? If not, does an extended choke make up the difference? I'd appreciate any advice that you can give me. Thanks! Al