Sony Alpha 6400
The Sony Alpha 6400 is the successor to the popular Alpha 6300, adding an improved tracking autofocus for generic objects as well as an eye-AF for animals. Furthermore, the internal buffer for continuous shooting has been doubled in capacity.
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 6400. Expensive UHS-II cards or just premium UHS-I cards do not offer any advantage in terms of speed (burst shooting) or video capabilities.