Well, whatever you end up shooting, test it BEFORE the wedding, you do not want to screw up because you haven't shot the film before. Get to know how it responds to different things such as underexposure and overexposure. It will definitely be to your advantage. Also, stick with what you know and comfortable with, don't change just because you think it might look slightly better; it's not worth the risk.

I learned this the hard way...