Seriously.
I know there are detectors for any kind of detecting in the market. And they're split into two big groups, Water and Land machines.
But that wasn't the question. It is really about if you can only have one, which one will fit your needs most.
So, I'm a relic hunter I think. But also like hunting the beach (digging is that easy there). But never would do detecting into the water.
And so every detectorist has it's likings. And I also know many have more than one detector.
Haven't said this will be easy in answering but have also read some swear by their old Teknetics Mark 1 or their Compass X100.
If you're undecided may be you may think a little more about.
A lot of detectorists will be interested in reading these opinions every one has I think, as I'm interested in reading the replies, too.
Thanks for your interest.