Which? There were 2 E3 trailers.
Here's a list of the official trailers that were released:
TGS 2003
E3 2004
TGS 2004
JF 2004
E3 2005
SEP 2005
Well, since the SEP trailer still isn't on the internet, my favorite is either the TGS 2003 or 2004. One of those.