I'm not sure I could pick ONE favorite.
Calls can be "favorite" for so many reasons......
First turkey call ever
First call you ever made yourself
A call that was your dad's or dear friend's
A call made from special/sentimental wood
A call that is just SMOKE for killin' birds
A call with historical significance
Your most collectible call
A call you used on an especially memorable hunt
And on and on and on.......
See ??
I'm not even sure I could pick just ONE for each of the categories I listed above.