That’s a question that requires a long answer! This document outlines them for you: Student Response Systems Comparison Table.
For reference, TurningPoint, commonly referred to as “clickers,” is the university’s older classroom response system. Top Hat is a newer system that has been in use at Miami University since 2020.
Top Hat provides a great deal of vendor support, including occasional in-person training sessions. It’s a robust solution that offers many use cases. Your use of Top Hat can range from interactive polling in face-to-face classes to creating interactive text in Canvas. Learn more from Top Hat’s website.