Whilst I'll be the first to admit I don't have a clue but I don't think there is a 'right' or a 'wrong' body for weddings.
If you ask other professional wedding photographers I'm sure you'll get a divide between Nikon and Canon as it's opinion and general preference.
However, whilst the body isn't so important the lenses are so you'll need to invest in some good quality glass so make sure you like which body brand you choose as it could be expensive to swap with all of the lenses.