If you are interested in learning /music/ and not just learning the /guitar/, I would strongly encourage you to start on the piano.
I started on the piano and moved to the guitar later, and I've now realised that the piano gives you such a good musical grounding, so much better than the guitar can. There's nothing quite like having it all laid out in front of you. It's the only way that things like sharps and flats make sense, it doesn't make much sense on a guitar and that makes musical theory difficult to learn.
I started on the piano and moved to the guitar later, and I've now realised that the piano gives you such a good musical grounding, so much better than the guitar can. There's nothing quite like having it all laid out in front of you. It's the only way that things like sharps and flats make sense, it doesn't make much sense on a guitar and that makes musical theory difficult to learn.