Do you mean movies? If so, I like Akira better and the escaflowne movie was darker, which leaves a larger impression on me. I wasn't considering movies exclusively when I said that I didn't like Porco Rosso the most...I guess there aren't that many good anime movies that I can think of right now

Hm, if you consider all 4 original kenshin OVAs, which really need to be viewed as one film anyway, I would rank it over Porco, as well. Did they make a movie version of that all hacked up? Never watched that one...Hm, maybe the original Ghost in the Shell. I've seen all of these multiple times, and I would watch any of the darker ones again if I had time to kill and I was bored out of my skull, but I really wouldn't pull out Porco Rosso again unless I had kids to entertain.
I was about to mention Perfect Blue as being perhaps tied with Porco or just under, but decided to stop with all that dark nonsense

It's not that groundbreaking as a story, but well executed, and I thought to myself, "surely Porco is better than that."