You need to understand that TC barrels are measured for their overall length. So the 20Ga Pro Hunter barrels are 28" long but you have subtract 3" for the chamber. That gives you about 25" of rifling. Would the 2" more length make a big difference? Probably not but I think the Pro Hunter barrels look better. That's why I have the 20Ga Pro Hunter slug barrel. You will pay around $270 for a 26" blued standard 20ga slug barrel and around $310 for a 28" SS Pro Hunter 20ga slug barrel.

Also, Pro Hunter barrels will fit standard Encore receivers and standard barrels will fit the Pro Hunter receiver. Go for the 28" SS Pro Hunter.