I prefer a diaphragm call over others because it is easy access for use, it requires very little movement to use. I haven't bought one in years, have several and I toss them into a mixture of water and mouth wash each year, test them and select 3 or 4 I think sound the best. I don't even know who the manufactures are anymore. Some double reeds, others very.
For years. I used nothing but diaphragm calls. Now I carry a Lynch Box call because my vest allows east carry for the box and I use it occasionally usually on wind days or I am calling long range. I also carry a slate and glass calls again because they are an easy carry with pouches for the calls and strikers on my vest. I use these when a gobbler seems to go silent to my diaphragm call or is apparently hung up but close. Some putts and purrs can be made with the diaphragm and/or with the strikers to sound like one or more hens.....
I do use a crow locator call and would not be without one...
I am not one to do a lot of calling, whereas, if a gobbler is coming in I let it come. However, if it appears he is losing interest I try to get him excited once again.
As for as particular turkey calls if he is on the morning roost I make one tree call and wait, when he flies down a yelp or two and see what he does to determine my calling and if he has hens or other gobblers with him....If I can see him I can tell how he is reacting and can adjust my calling amount or change from a yelp, cluck or perhaps a cackle.
When he is in range if he is moving I hold the bead on his head and a make a low chuck or putt. He usually turns his heads to the side and stands idle long enough for a well placed shot.