I saw that you were battling with tables. The easy way it to create the table in a normal editor (notepad, vi, ...) and next post it using code tags (the </> button).
Slightly more complex, the below based on Markdown Cheatsheet · adam-p/markdown-here Wiki · GitHub
| Arduino | Raspberry Pi |
|---|---|
| Is a dedicated control device | generic compute |
| Can be very small | relatively large |
| Low power | higher power draw |
| Directly control solid state relay | may need interface |
| inbuilt comms limited | excellent comms |