Both endings are the same so don't waste your time on it.
There is a "perfect" ending with 30 seconds of extra cutscene in which:
After you see the fee crash land, a camera pans over somewhere and you see Shepards body and dog tags... Then you see a gasp for air and the credits hit
With the DLC they have planned, it's likely that this isn't the real ending. Some of the devs say they have some crazy shit planned, but I don't know. I don't want the big cheery ending. Hated the ending because you don't know what happens to the crew so there's no closure there really. The aliens on your crew must have been pissed off, but who knows?