Classkick or Formative? This is a question I get a lot. The short answer is: BOTH. The long answer is, well, longer. Like any other tool comparison, it depends on what you want to do with them. I really like them both for different reasons.
Here is a chart I created that compares some of my favorite features. I hope it helps you decide which one you need for your lesson tomorrow!
The good news with these two tools is that no matter which one you choose, you will have picked a great one.