Because I teach 2D game development using Corona SDK as well as Unity, I'm often (weekly, at least) asked, "Which one is better for me to learn?"
I finally decided to sit down and write something giving my thoughts on both -- I ranked both tools in 7 different areas and then added them up...
...and was honestly surprised with the results!
If you'd like a copy of the report, "Engines and Frameworks for 2D Game Development" just fill in the form below and I'll email you a link to the PDF file. There's no cost involved, and as long as you remain on my list I'll send you notices every once in a while on new game dev courses, etc.