Different solutions for different people. Find the tool that works best for you or is the most like your other workflows. Well tested with lots of high quality products make this a good bet for final products.

For open source project cocos2d has mantain a very god community. It mean, a bug issue and help are always on their forum. Super good for fast prototyping game without headaches. Some famous games like Bad land , hill climb racing , 2048 are products of cocos2d (Obj C) and his brother cocos2dx (c++).

Cocos2D is very flexible, supported by good UI Widget that help new users to make their game easily. Other than that, Because cocos is already famous from the start, when I tried to find tutorial can easily found. When i'm trying to make some html5 games using cocos2d, I read the API online of cocos and it help me very much, and when I'm downloading full version of cocos, they give example of game that can be easily understand and can be used as preferences for my next game