Canon 5D Mark III or Nikon D800


I'm an aspiring wedding photographer. I've shot with the 5D and was almost set on buying it for my next shoot. But, I asked a couple of other wedding photographers and they all use Nikon. They nearly all recommended the D800 for wedding photography. So, now I'm puzzled. The D800 is cheaper, but I've been shooting with Canon for such a long time and I honestly like their UI a lot better. Should I research other cameras too? So, please put your input in.Thanks!