should i look at gundam SEED before i look at gundam seed destiny???

because i dont get the hang of all of it and whats up with kira he shows up from nowhere and pretands that hes a hero. the only thing that i know about him is that he's from the war that ended a long time ago and athrun was his team mate..... so whats best?? [img]i/expressions/face-icon-small-confused.gif[/img]