If you're left handed and you've spent any time playing guitar then you've probably already decided which way (right or left handed) you want to play. However, if you haven't ever played guitar before it's just as easy (or hard) to play one way as it is the other until you've practised a bit and got your hands used to their different roles.
Bear in mind though, that while left handed guitars are almost as easy to get hold of as right handed ones - you could probably get one in any guitar shop - you wouldn't be able to play anyone else's guitar unless they've got a left handed guitar too. Most of the left handed guitar players I know play right handed because of this.
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