I'm not a pro. But i've shot about 10 weddings. The fact i'm still in good relationships may mean that the pictures have been appreciated.
I've been using, mainly, Fuji Reala 100 iso, Fuji NPH 400. Lat one i did i used Reala and Kodak portra 160 (both VC and NC). Much depends on the light/lenses/moment of the day (morning, afternoon, night). If you have wide aperture lenses 100/160 could be ok for outdoors and 400 for indoors (provided it's in the morning/afternoon). If the wedding is in a Church go and talk with the Priest some days before. Have fun.