title: SpriteSheet, AtlasSprite, Sprite and optimization
body: <p>I'm developing an iPhone Cocos2D game and reading about optimization. some say use spritesheet whenever possible. others say use atlassprite whenever possible and others say sprite is fine.<br>
  I don't get the "whenever possible", when each one can and can't be used?<br>
  Also what is the best case for each type?<br>
  My game will typically use 100 sprites in a grid, with about 5 types of sprites and some other single sprites. What is the best setup for that? guidelines for deciding for general cases will help too.</p>