Sony Alpha 6600
The Sony A6600 is the successor to the popular Alpha 6500, using the larger NP-FZ100 battery and adding an improved tracking autofocus for generic objects as well as an eye-AF for animals. Unfortunately, the internal buffer for continuous shooting is now not even half the size, so better don't skimp on your memory card.
We generally recommend SDXC memory cards (64GB and more) with an UHS-I-interface and a SD Speed Class from U3/V30 or above, if you're using a Sony Alpha 6600. Expensive UHS-II cards or premium UHS-I cards do not offer any advantage in terms of speed (burst shooting) or video capabilities.