Marineford is great mainly because of just how strong of an impression Whitebeard manages to make in a relatively short amount of time. Besides that and the high dramatic points that come with Ace's and WB's deaths, there is also the sheer hype of having the first large-scale confrontation between several truly powerful figures we've previously only caught small glimpses of. That's what I would praise MF for.
On the other hand, many characters simply don't get to do much of substance. The arc at points feels kinda cluttered and messy in a way that foreshadows the symptoms several post-skip arcs will fall to wholeheartedly.
Enies Lobby, on the other hand, has a tighter structure and pacing, all of the Strawhats the readers have already fallen in love with are given their time to shine. The Ohara flashback is a treat, and so is the resolution of Robin's conflict (I stand by the point that her scene with Kuzan at the end is heavily underrated in general, definitely in my top-15 scenes of OP).
So, it's EL for me. Though I think Water 7, Sabaody Archipelago and Impel Down are even better, if ever so slightly.