To me the answer is neither, the Mamiya TLRs have all the advantages of the Rollie square format plus interchangeable lenses with leaf shutters for fill in flash that stepping back twenty years were standard equipment because of these factors and the fact that they are mechanically very simple and reliable and have a straight film path that keeps the film very flat, I've in the past done many weddings with a couple of these bodys and a set of lenses.
If you are going to shoot weddings whatever you buy before you use it in anger have it professionally CLAd , because there's enough things that can go wrong at weddings you don't get second chances you have to produce results not excuses.