Of course I use the ones I make, but for commercial calls, I use the Sceery, and the Primos calls are hard to beat. There are a lot out there. The key, is not so much what call you use, but how confidence you have in the call you are using. While it may be nice to try to use a call that will match the sounds of the prey the coyote is used to encountering, this isn't like trout fishing where you might try to "match the hatch". If it sounds hurt, he will come to investigate.