6 plus advantages for me: better screen. Better camera. Better apps (iPad like apps), better battery.
6 advantages for me: smaller and easier to workout with/handle/ operate etc
It seems like a no brainer but I'm still torn.
I was thinking a lot, but im settled for 4.7, im sorry but in a busy environment to use 5.5 will be too difficult and awkward, not to mention to keep it in your pocket while on holidays etc.
Even just to take a quick photo, 4.7 much more convenient.
Im upgrading from 4S with its tiny 3.5 screen, so for me 4.7 will be a god send already
just my 2 c