Jim is right - I'd have to not have the colour version available.
Also, people use several techniques to convert to greyscale within image software, like Photoshop, that provide a lot more flexibility than a simple "convert to greyscale" type function. You might, for example, want to focus on the colours in a specific colour channel. It's difficult to explain, but there are several articles I have read which demonstrate the possible effects.
I say shoot in Colour and then consider greyscale in post-processing, although I'm biased because I prefer colour prints usually anyway.
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