I don't have any experience with Simple Machine Forum software.
How does it compare to Forumotion, Proboards, and Jcink?
There's a service called "Createaforum" that is similar to Forumotion, Proboards, and Jcink. Meaning you can try out SMF without having to install anything. If you want to check it out here's their hosting, since it's a different platform than what those three offer there will be some differences you'll have to get used to when using the platform.
https://www.createaforum.com/