Silly will have the definitive word on this, but I think it really depends (don't you hate when people say that?). A road bike is a good choice if you have a commute on mostly good road. It's excellent for cross training. A hybrid is a great choice for commuting, depending on the tire size you put on; you could use it for training too, but it would be a little less fun (and here, I'm equating going fast with fun).
I think ultimately it comes down to personal preference. You can get used to the road bike profile pretty quickly though, assuming you don't have any back or neck problems that would prevent it.
Hopefully Silly will chime in because she not only works at a LBS, she commutes there on a bike.
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