Hi. I heard people that have the 6 are having some trouble with it. Not getting service randomly, touch screen not working, etc. I have the 5s and love it. I'm pretty sure the 6 doesn't have that many features that the 5s doesn't have but I'm not entirely sure.

If I were you I'd either wait a little bit to see if they start fixing the kinks that the 6 has or just get the 5s for free.