CCNA, CCNP, MCSA, CCNA Final Exam, All Answer Test Module With 100/100

I just finished reading some of the cocos2d documentation, and as far as I understand to add a background image to a layer you have to do something like: Sprite * bg = [Sprite spriteWithFile:@"Background.png"]; [layer addChild:bg z:0]; Allthough as far as my testing goes you can just directly add the sprite to the scene like this: @implementation IntroScene - (id) init { self = [super init]; if (self != nil) { Sprite * bg = [Sprite spriteWithFile:@"Background.png"]; [bg setPosition:ccp(240, 160)]; [self addChild:bg z:0]; [self addChild:[MenuLayer node] z:1]; } return self; } What is the difference between this 2 options, and what is the better way to set a background for a layer?. Any help will be greatly appreciated.