I used Portra 400VC for one wedding season and then I switched to Agfa Optima 400 II after that. I just don't see any quality difference between the major league films except that the Agfa is 2/3's the price.
About year ago Photo Techniques did a test on all of the pro ISO 400 prints films and I fully expected the Agfa film to bring up the rear. Well in the vast majority of testing areas it actually won! the only thing that the Agfa doesn't do well is when you need to push it. I guess there's a significant colour shift when you try it, so I've promised myself that I won't!
I would strongly suggest that whatever brand you choose, that you use an ISO 400 film. Your flash will be a stop and a third more powerful and you won't be dropping down nearly as far for available light shots in the church. One year I bought a box of ISO 160 film and a few rolls of 400 for emergiencies. Then I found that I was using the 400 first while ignoring the 160. So bye bye 160!
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