We had this one two years ago, but a reader email got us thinking that it might be a good idea to give it another shot and see if preferences have changed. The market trends certainly have and now metal is by far the the most popular material on any smartphone - flagship or not. But has that resulted in its devaluation as a luxury good or are you still considering it the most premium of materials? On the hand there are those that prefer their phones covered with glass - the cool reflection effects and the gloss certainly look fancy even if they require plenty of upkeep to keep fingerprints...
Source: http://www.gsmarena.com/weekly_poll_what_materials_should_flagships_use-news-26182.php