having both, I would recommend the 31mm, which is my go-to walk-around lens, because of small size, and low light versatility. I think shooting with a prime lens is a more creative lens choice than a zoom. the fast aperture gives you some great options.
the 28-105 is good enough anyhow, and I don't think that the 24-28mm that you gain is that important. Main use for the 24-70mm is a fast zoom for shooting in average light conditions, such as an event, concert, indoors etc.
Word on the autofocus - the 31mm is not as accurate as the 24-70mm.
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