I went with Tatsu but my favorite seems to change often.
Before that, my favorite was TERMINATOR: SALVATION. Then they got rid of the on-ride music. The ride just isn't the same. And then they turned it into Apocalypse. How boring.
Before that, my favorite was X (but I stopped liking it cuz the ride HURTS)
Before that, my favorite ride was Riddler's Revenge.
But there is something admirable about...
It's just so simple and fun, I LOVE IT. It goes to show that you don't need a bunch of nonsensical loops to make a coaster great. It also has great length. I wanna say it's my favorite ride... but I always feel weird saying/admitting that. It's not nostalgia or anything either, I honestly didn't even ride this ride on my first trip to Six Flags which was around back when Goliath opened (or at least I don't think I rode it). Something about the ride is just RIGHT.
Also, gotta say, I used to HATE Superman but now I LOVE IT going backwards and looking straight down. A MUCH better thrill ride.