Go and try some multipe calls out and see which one fits you best. Alot of competition sounds are not used in the field. if you can cluck and moan and some good loud honk to get their attention that should be all you need to kill gesse. I mainly cluck until they get in closed and it turn to a moan or mur-mur.
I use the Foiles calls but that is what fit me best and I have just stuck with them. I have blown other call and there is alot of good calls out there!
Good luck and shoot staright!!