I like them both a lot but would lean towards "Stairway" because of the memories of school dances and a lot of "firsts" in the back of a 1972 Chevy Impala...
On a fun note, if you are not familiar with these guys "Dread Zeppelin"
http://en.wikipedia.org/wiki/Dread_Zeppelin
Not to be a philistine but Zepp + reggae+ Elvis is hard to beat in my book.