Mark is interested in a good camera gimbal for his mobile device. Leo says that DJI has a great line called the DJI Ronin for DSLRs and other cameras, and the Osmo For smaller cameras. He can even get them for action cameras and mobile devices. Or, he can go with the DJI Osmo Pocket which has its own camera built-in. So it largely depends on the budget. It's generally more affordable to get one for a smartphone.
There's also a great one for vloggers called the ZVb1. But it's not a gimbal per se. takes advantage of the camera's internal Optical Image stabilization.