Excal 1000, Excal II, Sovereign GT, CZ-20, Tiger Shark, Tejon, GTI 1500, Surfmaster Pulse, CZ6a, DFX, AT PRO, Fisher 1235, Surf PI Pro, 1280-X, many more because I enjoy learning them. New Garrett Ca
They are as different as cats and dogs. I perfer the Tesoro becuse it works different from most PI's, more like a Infinium LS,, but with a longer battery usage. For more info read the field tests on the Sand Shark.
Also with the Sand Shark you have the option of changing the coils yourself.