I really like both, and it can really depend on what I'm looking for musically to decide which I'd prefer to listen to. I love a good electric guitar solo, but acoustic is so warm, inviting, relaxing and pleasant that it's so perfect to chill out to, just like acoustic piano. So for a good solo, I prefer electric, but to relax, I prefer acoustic.

Overall I tend to listen to more electric since that's the staple in classic and progressive rock, but sometimes that's too noisy and oppressive, and I need something unplugged - quiet and soothing.