Voice gobble, then you have nothing extra to carry and nothing to choke on.
A friend used a shaker gobble call this past weekend. (not sure of the brand) From about 10 feet away, it had the cheesiest sound... nothing like a turkey. I have a Haint gobble call and get a really good tone from it. My only problem is I tend to blow too hard initially and the reed locks up at first. I think if I can ever train my brain for the airflow, it will be a deadly tool in the woods.
While guiding on a youth hunt 2 weeks ago, I voice gobbled at a bird that was gobbling his head off about 150 yards across a 20 foot wide creek. After I gobbled he got really quiet. About 10 minutes later, he was strutting on our side of the creek about 100 yards away. We'll never know what "might have been", as someone in a red jeep decided that 7:30 am on THAT particular Sunday morning was THE best time to drive down the road between us and the gobbler...