For the breakfast buffets, I'd put the food at Tusker & 1900PF about on a level. The tiebreakers would be location and kids' preference of characters.
As several have pointed out, Ohana they bring to you while Tusker & 1900PF you go get. If balancing the kids and the plates is too much of a problem, then Ohana - but you get a lot more to choose from at the 2 buffets.
Of the 2 buffets I give a slight edge to 1900PF, in part for the strawberry soup and in part for the "Brittish" Disney characters (from Pooh, Alice, and/or Mary Poppins).