If you bend over / drop knee to recover, I would stick with the Garrett pin point for the dry sand zone at the beach as it detects off the side as well as off the tip. This allows you to rapidly determine if there are multiple shallow targets. Also you can move dry sand with its ridged side. Be careful not to bend the probe as it will cause false alarms and the probe early demise.
With care you can use the garrett pin pointer on wet sand, but avoid moving the wet sand, which is heavy with the raised edge.
The Vibra Probe 580 is best for shallow water hunting, with a towed sifter. Many hunters tie it directly to the float sifter that they empty after several scoopfuls in .to rapidly recover metal in the debris which has not sifted out before flipping it over.
It is of no use, in the water , unless you are towing a sifter