Drones are an amazing photographic tool. They are getting more reliable with an impressive list of features. These are the drones I use.
The 4 Pro is a great piece of equipment with impressive 4k video capabilities. For a 4 blade drone, the 4 PRO is more stable that other models, and drones by other manufacturers, but wind is still a major factor when flying.
The main benefits of the Mavic PRO is that it is portable and costs less than the Phantom series - but it still takes great videos. The main issue when considering the Mavic is that it will require almost no wind when flying. But hey, you can fit it in your suitcase!