When you have a more powerful system, Compact O.S. is the best choice for your device because you have a real time operating system and more features. In this case, an Internet Of Things application can be developed using .Net Compact Framework (version depends on Compact version used) and thanks to M2Mqtt library you can use the same code for publishing and subscribing topics as in .Net Micro Framework.
You will see in the next chapter that the same concept can be applied to Windows Embedded Compact standard using desktop .Net Framework to develop subscriber part of the example.