Great question! I generally tend to agree with Elton BUT..........without complicating the original question....each of us are seeking to detect different kinds of targets and that's perfectly fine.
Some of us are relic hunters, some are coin shooters, some are into meteorite hunting, some are looking and detecting for gold nuggets, some are dreaming of detecting that big gold or silver cache and then some specialise in ghost town hunting and looking for those old mining implements and relics etc;!
Then there are the beach hunters which I particularly love to do. So for me, the California beach's would have to take my vote
! Although If I were younger, I wouldn't hesitate to cast 2 votes for diving for shipwreck treasure off the coasts of Florida and the Gulf!