Why buy just one more choke? Why limit yourself to that option...they aren't that expensive. The advantage to having a screw in choke system is that you CAN change your choke to suit the situation. If I had to have one gun, with a FIXED choke, I would probably pick modified and use shells to tighten or open the choke as necessary....buffered copper or nickle plated loads to tighten it, and cube shot or spreader loads to open it. But just because a gun is marked "modified", or "full", or anything else, doesn't necessarily mean that is the pattern it throws...you need to pattern your loads to make sure what it is throwing. Good luck and good hunting.