Kodak 400 NC or Fuji NPH depending on taste. the Fuji is more saturated but low contrast. My choice would be the Kodak. If its a dull day, you might consider Kodak Portra 400 UC. Saturated, but with excellent skintones.

You really should test. I note that everyone's who responded so far has recommended a low contrast color film. good advise. ignore the Superia for a wedding.
Take care,
Tom