I'm not sure that is an either or decision, I have not shot many weddings, but when I did, I always use either a Mamyia Universal or a Range Finder during the service. I have also used a RF for funerals ect. The N 90 is a great camera and in most cases works very well, but for quite I would think about a M 6, M 4, (if you are shooting indoors with a flash you may not need TLM) or even a M 3.

Regards