Everything being equal I'd normally take an 870. But the 1300 is a good, under rated gun. To me it would be worth the money to have the versatility of the choke tubes and the 3" shells to go with the 1300.
Even though most of my shotguns have interchangeable tubes I use IC about 90% of the time. If the Wingmaster were IC or Modified I might feel different. A fixed full choke is the least versatile of all the fixed chokes in my opinion.