It really depends on the length of your shots, what type of shells you are shooting, what type of gun, your experience in shooting... For me, I switch between two chokes depending on where I hunt. One place I like my stock modified choke because the ducks come in somewhat close and another spot I have some longer shots so I shoot an after market modified that lets me reach out a little farther. Pattern your gun, try different set ups and see what works best for you.