depends on your use case. i'm using the galaxy note 3 right now, and i find the iphone 6s plus can't do what i want it to do. the biggest irk for me is the terrible keyboard. i can't find a single decent one handed keyboard with swype. since there's no back button, i always have to use two hands to go back (on my note, i use 1 hand for everything). their one-handed mode is cool how it brings apps down, but it really needs to move it to the right/left as well. one handed mode doesn't do much good if my thumb can't reach the other side. i also can't sync my email by folder, i need to turn on gps for the weather app to work, i can't have widgets on my home screen, i can't use my thunderstorm background. on my note 3 i can spend next to nothing to add a nice sd card, whereas iphones charge hundreds of dollars for more space.
so for me, iphone is out. but it might be fine for you.