I think the "thumb reach" advantage is marginal at best. Phones these days are more like mini-tablets ( http://www.paulgraham.com/tablets.html http://www.paulgr

I think the "thumb reach" advantage is marginal at best. Phones these days are more like mini-tablets ( http://www.paulgraham.com/tablets.html http://www.paulgraham.com/tablets.html ) and therefore you'll want your phone to be as big as possible to maximize your viewing experience (web, games, pictures, videos) while also still keeping its extreme portability of a smartphone (having it with your at all times). As long as they fit well in your pocket, and you don't think it's awkward having a too large phone, then bigger phones are better for most things. Some people will be comfortable with 4", others with 4.3", others with 4.7" and others with 5.3".