I don't watch many videos on my phones so a larger screen makes no sense to me.
Right now, my iPhone fits nicely into my ziparound wallet that I like to carry as a clutch sometimes. Anything bigger would be redundant. That's just for myself though.
Personally I love iPhones; but some people do not like being 'locked in'. But the organisation and syncing is something I'm familiar with and I really like. I use Calibre for my Nook and can't imagine not having a program that syncs for my phone.
Dragging and pulling into folders? No thanks.