Do you mean two separate machines? Or one machine that can do both venues? Because if you meant one machine that can switch back and forth between those two stated goals, then just be aware: it will excel in neither arena. Yes there are machines made to be able to switch back and forth between a) nuggets, and b) coins/jewelry, with the flips of some controls. But when you think of it, the goals of each type hunting are almost diametrically opposed. A nugget guy wants a machine that can hear every single staple, birdshot, paperclip, etc... to insane depths. But the coin/jewelry guy DOESN'T want to hear every "staple, birdshot, etc...." And since the machines nowadays are built from the ground up, to do their intended purpose (coils, etc...), it's no easy feat to make a machine that go back and forth, and do both. Yes there are some that are made to do it, but trust me: there are MUCH better coin/jewelry/beach machines, and there are much better nugget machines.
Also, the type of beach comes into question. Did you mean freshwater or salt water? Wet sand or dry sand or both? And how picky are you wanting to be? Because, for example, the MXT is a machine that can do both. But as an example, it will suffer badly on the wet salt beach (you'll get your b*tt kicked if you're around other dedicated beach machines), and ...... there are nugget machines (for the super hardcore) that likewise will outpace that as well for nuggets.