Samsung Galaxy S4 and Sony Xperia Z-both top models with 5 inch screens. We have seen more detail on screen specifications.
Samsung writes in their press release that Galaxy S4 is the world’s first mobile phone with a Full HD (1920 x 1080) Super AMOLED screen on the 5 inch with 441ppi.
And you look at the actual display type, then the first. But otherwise it is Sony, which in their top model Xperia Z has a display with 443ppi and a resolution of 1980 x 1080 pixels. But this is not a Super AMOLED screen, but rather their own Mobile Bravia Engine 2 screen technology.
However, both devices have a 5 inch screen and what you think is best, it is essentially a temperamentssag. For the 2ppi, that Sony has more than Samsung is probably hardly something the human eye detects.
What type of monitor is your favorite?