The advantage of the TurtleBot3 (Burger or Waffle version) is that it offers endless evolution opportunities. For instance, you can tap into the full range of Robotis sensors to make your robot even smarter and more interactive. TurtleBot3 already includes an inertial measurement unit featuring the Burger material required for navigational efficiency, and can be connected to various sensors (movement, temperature, colour, contact, and so on).
If you want to learn ROS, advanced robotics and computer science concepts, then Turtlebot3 is a great choice! ROS is a meta-operating system, something between an operating system and middleware. ROS is becoming increasingly popular with research labs, startups, but also large companies.
You can also transform its mechanical structure radically to turn it into a motorbike or a car, or add a trailer... Simply give free rein to your imagination!