I want to get a strong engine to practice while I'm not home. Look at: http://stockfishchess.org/download, we see a list of apps to download for the Stockfish engine.
Why are there three apps to downloads for the same engine? Which one should I choose? What are their advantages and disadvantages? Which one is the strongest? Which one is the easiest to use? What functionality do they offer?
PS: I have an iPhone 5 and Android tablet.