Difference between Slowpoke and Stick-in-the-mud

What is the difference between Slowpoke and Stick-in-the-mud?

Slowpoke as a noun is a mild insult for a person that moves slowly. while Stick-in-the-mud as a noun is a person unwilling to participate in activities; a curmudgeon or party pooper.

We hope you now know whether to use Slowpoke or Stick-in-the-mud in your sentence.