I have to go with corruption (every time I see the crimson, I start to get bored)
I know that feelsCorruption. Personally I prefer Shadow Armor/other corrupted items over crimson items, plus the music.
My god, the music is perfection.
It's fun and sounds adventurous.
The Crimson, however, is just.. gross. Call me a pussbag, but I have to take breaks every now and then when I'm in the Crimson, just because of the sheer grossness of everything. The music doesn't help.
tl;dr: I like Corruption because it's fun and not gross.