I myself prefer the Briley extended Modified or ext. Improved Modified for all of my waterfowl shooting. I shoot Kent Fasteel and am now going almost exclusively Hevi-Metal in 3" 2's and BB's for ducks and 3"BB's and 3-1/2" B's for geese. I shoot the BB's solely in the ext. Modified tube.
The huge reason I really like the extended tubes are that if you are not a real cleaning fanatic, they can get gunked/watered in and you will have a nightmare getting them out with a flush fitting tube. An extended tube gets a tad sticky to remove, just put an old leather belt around it and use a slip jaw pliers on it. Have somehold the weapon, after both of you visually inspect the weapon to ensure it is clean and clear of any ammo and none in the immediate area, twist out the sticky/stuck tube. Give it a shot of PB Blaster and let sit for awhile and it will come out. Make sure you clean the threads in the beginning of season well and you should never have to deal with this as I have for several people and clients. And as Big Z stated, anti-seize goes a long way. Use it each time you take a tube out and replace it and you are good to go.