I know that Vader is the better wrestler, but I'm voting for Earthquake because I grew up watching Earthquake in the golden era of WWF. Earthquake killing Jake's snake Damien was a tramatic moment in my childhood, lol, forever burned into my memory.
Never knew anything other than WWF existed until '95, so I didn't see Vader until he showed up in WWF, I remember him attacking Gorilla Monsoon.
So, Earthquake is more memorable in my mind, although, I remember Vader being on an episode of Baywatch too.