It all depends on what and where you use your 28 gauge.For all around use the modified works best.Now in certain areas or times of the year ,different chokes work better.Improved cylinder early in the season when leaves are thick and shots close.Full for late in the season when leaves are off and birds more gun shy.The modified gives you a good compromise for all around use.
If you have two barrels, and two chokes, you don't have to compromise.