You're a tall guy and bigger than average. Personally I think the 4'8" Broadcast will be too small for you at the beginning. IMO, of the two the Ride at 5'3" is a better choice.
I know that there are folks that can ride the broadcast at your size, and they "feel" they are doing well, but...if they haven't ridden a properly sized board, they simply have no idea what they COULD be doing. Also, those folks are pretty limited in what they can ride. Move them past their own wake and they struggle. This won't happen if you are on a properly sized board.
James is incredibly talented, but also, his board fits him.
Now, may I ask...are you limiting yourself to just those two board options? Some folks do, simply, because they want to purchase from a local dealer and that is all that is available.