Mouth call proficiency is often just a function of learning the basics, practicing enough to master the art of air-flow control, and then determining which call type works best for the individual. Once an individual learns to make the basic sounds,...i.e., like you have shown with your sound bite,...the process is then a matter of practicing and refining those sounds. That sound refinement will always include using a wide assortment of call types to find out which ones you will be the best with.
There are almost limitless factors associated with the call user and the call type. The shape of the mouth is only one of many associated with the user. Others are the positioning of the call along the palate, tongue dexterity, and ability to control air flow. The factors in the call itself which will control sound are the number of latex (reed) layers, thickness of the layers, reed spacing, reed stretch, and the cuts in the reed(s).
The fact is that there are so many variables for each individual caller that it is virtually impossible for one mouth call user to tell another that "this is the call for you". It is true that certain call types make certain turkey sounds, on the average, better than other types. But the fact remains that each of us must go through a learning process to find out what works best for us as individuals.
I think the real problem with most beginning mouth call users is that they get frustrated and give up before they have spent enough time to find out that they can really learn how to use a mouth call,...with enough dedication and practice. The keys are 1) don't give up, 2) practice as much as you can, 3) get an assortment of call types to use to find out what works best for you.