The linux gizmos mag has a nice and helpful review/compilation of all kind of single board computers created in Jan 2017.
Brief reviews on the site look like this:
They also have a spreadsheet online to get the full overview.
Why do I blog this? I always wanted to play around with one of these. I did a bit playing around with Arduino but never went for something more than a 20-40 lines of code. Maybe this helps to get me into a deeper sphere of playing around with these quite powerful things.