You'll get 15 different response for sure,and may be more confused than when you started.
Most any of todays turkey chokes will work just fine.You will have to spend a little time,and more importantly some money on different shells,figuring out which load your gun likes with your choke,and determining your effective range.What works on 1 gun may not work with another.Personally I have shot my 870 super mag with several different chokes.The star dot shot better than a kicks,undertaker,mad max,or factory turkey choke in my gun.All but the factory choke were very effective past 40yds.My gun likes 3.5"Winchester HV #4's.Hope I helped.