Hello Misa! I am currently using an Iphone 4, but fluctuate in usage and tend to lead towards purchasing and utilizing Android devices when I know there will be a higher demand for typing correspondences for work and academic purposes--see QWERTY keyboard accessibility with Droid devices V. Apple. In the near future I would like to acquire a phone in which enables me to most effectively generate business correspondences, take quality pictures, and is reliable--in that sense that it does not frequently lag or experience freezing issues. In my opinion, including the brands you've mentioned, each phone per the year and model will respectfully have it's pro's and con's--as everything in life does! However, with that being said, my experiences in the past would reflect that Samsung makes pretty reliable devices--see Galaxy series.