I like the 6-series design. I think they're the sleekest looking iPhones we've seen thus far. But truth be told, the design is getting a bit stale after 2 years. I'm starting to really appreciate the designs of Android phones that have trimmed their top/bottom bezels and get larger displays into the same footprint as an iPhone. Just look at the Note 5 compared to the 6+/6s+.
*And how the heck did predictive text put in "bit" in place of "not" in my previous comment?!*
Predictive text, gotta love it!
The 6 series are just boring looking and don't get me started on the camera bump! Also, the curved screen is really annoying as you can't fit a proper screen protector! The 4 and 5 have been the best looking in my opinion... Each to their own though, all have different tastes.