Everyone has their favorite detector brands. Everyone claims their brand is the best. Very few can differentiate why. A metal detector is made with one purpose. Finding metal. There is not a single form of discrimination, a single tone, a single id meter, which operates with precision flawlessly, with ANY brand. A detector is only as good as the detectorist using it. These are indisputable facts.
PI machines have no discrimination. Key to a PI machine is a good ear, and you can pick/choose the targets you want to dig. Their just as capable, some say more so, than any VLF machine on the market.
https://www.facebook.com/TesoroSandShark will show just a bit of what I, and others, dig regularly with a PI machine.
Many like to boast about the iron discrimination of VLF machines. Granted, a nice feature, and it works, as a whole. What you don't hear about, is the flip side of that coin, about all the tiny bits of aluminum foil and tin that they love. Pros and cons on both sides of the equation.
People ask me regularly, what is the key to my success. My answer is simple, and to the point:
"Machine go beep, dig hole".
He who digs the most trash, finds the most treasure!