Admittedly I am not much of a turkey hunter, our farm is pretty small and the birds more often than not roost near our lines and head away as soon as they get off the roost.
I have had my best luck calling with a lohman box call, think it is called a double thunder.
Have 4 or 5 slates, cannot tell you the name of any of them, can usually get birds to respond, but not much luck getting them in.
Somewhere I have some real old calls that belonged to my grandfather, know nothing about them, posted pics of them here a looooong time ago.