Forest, trees.
If you are meeting challenge, learn on a Jordan first; which the subject caller may be. Jordans have that small end for finer manipulation and have less to mess with you internally. The sound of a trumpet comes from you. The call just makes pulling on the elastic string of air inside it easier to do differently than just suckin' on a wingbone.
The best deal going for a Jordan is the Mosses Creek copy of Kenny Morgan's.