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The Phantom X Pan Tilt kit is an entry level pan tilt kit using the wildly popular Bioloid smart servos. With a resolution of 0.29°, rotation range of up to 300°, and speed up to 97rpm (0.103 sec/60°) you get a lot of performance for a great price.
The WidowX MK-IV Hexapod is a six legged, ROS research platform featuring the Rasberry PI 4b and the DYNAMIXEL XL Series Smart Servos from Robotis. The MK-IV comes pre-assembled and tested and is fully supported in Ubuntu 20.04c / ROS Noetic (Ubuntu 18.04c and Melodic are also supported). The platform offers wifi, tethered connection and wireless via Bluetooth / Playstation 4 Control options. The MK-IV Hexapod has a payload capacity of roughly 5lb, walking speed of roughly 178mm/s (default gait) and an estimated run time on battery of 60 minutes.