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Although I am a Nikon user and can't speak from personal experience from using either of these lenses, the 24-70mm would seem to me, to be a more useable zoom range than the 70-200mm. The 24mm will still allow for group shots, while the 70mm will be a good portrait length. The wide aperture would be more accomodating in low light situations where indoor flash is not permitted, as well as having a shallow depth of field.
Do you have the Canon 50mm f/1.8 MKII? If you don't, you may want to consider it, as it is also an excellent portrait lens, ideal for weddings because of its low light capabilities and is only about £90 new.
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