Based on a survey, Morgan Stanley reports a preference for the iPhone Plus. As Philip Elmer-DeWitt puts it in Fortune:
It shows a preference for the 5.5-inch model that’s nearly double that of U.S. buyers (26%).
On a related note:
By the end of 2014, Apple will most likely have sold more iPhone 6 Pluses in the US than Samsung has sold all Galaxy Note models combined.
— Ben Bajarin (@BenBajarin) September 23, 2014