I don't think it really helps to compare, because the markets will be different as well. There are some wedding people who make a boatload of money either way. I feel it is a matter of product and philosophy. There is no reason to to "spray and pray" with any format, just a tendency with the untrained or un-thoughtful. I think success as a wedding photographer is based on performance and marketing. You lick those and you can shoot what you want.