Geeze, I hate starting threads like this BUT...

For those of you who have seen one or even read enough to have even a tentative opinion, what are the pros and cons for these two brands in the 16x20/12x20/20x24 formats. I have a friend (me) who is interested in one of those formats from one of those 2 companies. I am talking about things like cost, weight, built quality...or if you want to be blunt about it, which 20x24 would you buy and why?
Thanks to all and have a great big-camera year!

Richard K.