When comparing pyglet vs Crafty.js, the Slant community recommends Crafty.js for most people. In the question“What are the best 2D game engines?” Crafty.js is ranked 37th while pyglet is ranked 43rd. The most important reason people chose Crafty.js is:
Easy to learn, based on Entities and Components, the later being class-like objects that entities inherit.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro 3D support
Since pyglet is so tightly woven with OpenGL it allows the support of drawing in 3D.
Pro Cross-platform
Works with Windows, Linux, and OS X.
Pro Written in pure Python
A small advantage, but being a core Python developer, it may be the best to stick to the roots and develop with pyglet as it is able to compile using other Python interpreters.

Pro Eventbinding
Easy to learn, based on Entities and Components, the later being class-like objects that entities inherit.

Pro Javascript
Pro Modular
Has open function binding systems, allowing easy creation of custom components.
Cons
Con Small community/popularity
There is a decent amount of documentation and API to go along with pyglet, but in terms of community support there seems to be very little.
Con No IDE
If you like having some huge GUI akin to Gamemaker, Unreal, Unity, etc, Crafty is not for you.
