Im sure you will get lots of opinions, but Ill add mine. Im a pot call fanatic, and my favorite top 3 choices are always ceramic, crystal, and copper. I have others, but I get more realism from those 3. Crystal has that nasally barking rasp and copper has good rasp and volume, and ceramic plays like a slate (easy to purr on, etc. ) but sounds more energetic and exciting. All three have good range of volume as well and will play loud or tone down for softer stuff.
Strikers,
Diamondwood, Osage, Persimmon, just to name a few of my favortites.