What is the Best Choke for a Tower Shoot?

This will be my first tower shoot and im not sure what kind of distances to expect. It will be in a semi auto 11-87 so I dont have the option of using two chokes as in a double barrel. I was thinking modified or full but not sure on the best out of the two.
 
A Tower shoot is where they organize a bunch of paid shooters that stand in pre determend locations around a tower then they turn out pheasents from the tower and the shooters have lots of fun when the pheasent come by. They normally have a couple different lines of shooters one behind the other and afterward they take dogs out to do clean up hunts for the pheasents that got away during the shoot.
 
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