Da best. Lol. It just depends on what you like and need. They all basically do the same thing. It's just about how well each one does it. For instance, you may be able to watch a movie on two phones but one may be sharper and have a better picture. Maybe if you told us what you use now and what you do and do not like about your phone now it would help us give a better suggestion.
Some of the best Smartphones include Samsung Galaxy S4, HTC One, Apple iPhone 5, Motorola Droid RAZR Maxx HD, Samsung Galaxy Note II and Samsung Galaxy S III. We also have LG Optimus G Pro, BlackBerry Z10, Nokia Lumia 920 and Google Nexus 4