I love my 6s. Incredible device, very satisfied with the purchase. It is just an all around great phone. 3D touch I am getting more and more used to every day and its a nifty thing to implement. Don't notice any usage difference from my 6 in terms of hours, in fact with iOS 9 and better saver its about 45 mins to 1hr 15 mins of extra battery usage I can get with normal use.
Touch ID is almost too fast, but I am getting used to it and prefer it this way. And the 2GB of ram makes such a huge difference, its a wonder Apple didn't make the switch earlier.
The 5S was pretty lame actually. It had an incremental CPU hike which was barely noticeable in the real world and a jump to 64Bit. Oh and Touch ID, but sadly it kept the same amount of RAM as the i5. As a 64Bit device uses more RAM than a 32Bit device the dreaded browser and app reloading made an appearance. The woeful iPhone 6 & 6+ milked the paltry 1GB of RAM even further with their bigger screens. I would put the iPhone 5 before the 5S. In real world terms it had more RAM than the 5S, i6 and 6+. I wish I had kept mine and jumped straight to the 6S+ for a proper across-the-board upgrade.
I have to disagree here; incremental CPU hike?? You're also implying
worse RAM usage with the 64 bit devices?
Are you sure you didn't mean to say the iPhone 6?
Cyclone was in no way incremental over Swift - it was a huge improvement in design, efficiency and power. Remember the context in 2013 during the early part of the year when the iPhone 5 was pretty state of the art but going toe-to-toe with flagship androids and losing out to some in the chip battles. Then the 5s came out and blew away every device in terms of power. It is hard to argue against the A7 being the largest design achievement for Apple thus far as far as mobile chips are concerned; it is also partly the reason why the A8 was such a small bump - because the A7 was such a leap forward. The 5s was a marvel in mobile design, with the A7 leading the way.
If anything, the iPhone 6/6+ was the "lamest" so to speak - the jump to the bigger screens and rounded designs was nice from a user perspective, but overall the A8 was a small bump in power and they used the exact same type of RAM. It was still a very powerful device, but that had more to do with the A7 being such a step forward in mobile design.
Regarding the ram usage in the 5s vs the 5; it is almost negligible and actually more in the favour of the 5s/6 than the 5 as you suggest - given the RAM in the 5s (LPDDR3) is about 1.5-2x as efficient and fast in most counts than the ram used in the 5/5c (LPDDR2), including bandwidth - never mind that the 5s has a much faster chip that push way more instructions than the 5 and way more cache shared by the system, and much lower latency. This is a big one as not only is the RAM faster but from what I recall about 4 times less latent...no way is less latent ram going to be worse, especially when its faster ram which all points to better memory management, not worse. 1GB on the 5 would perform worse than 1GB in the 5s/6.
It was evident on iOS 7 where everything was just instantaneous relative to the 5, and even more evident on iOS 8 where the 5/5c struggled at times with laggy frames pretty much up until iOS 8.3, whereas anecdotally the 5s and 6 were probably the two smoothest devices on iOS 8 (similarly specced too) - never mind the significant GPU bump the 5s was over the 5...safari tabs alone are not a great measure in terms of memory, especially when the 5 and 5s/6/6+ have the same amount. The 6+ smoothness and all that - those issues were not experienced with the 5s or 6 given they didn't have to put up with the downsampling that the 6+ did.
1GB ram was still a huge disappointment with the 6 and 6+, and the 1GB of ram limitations were real - don't get me wrong; more memory is always better - but the 6+ had its own set of issues that made it run worse and crash more than the 5s or the 6, and perhaps even the 5. To say the 5s was incremental over the 5 and imply that the RAM in the 5 would work better because "64 bit uses more than 32 bit" is not correct.
Regardless - the 6s blows every iPhone out of the water in specs, and that extra 1GB of ram is incredible with iOS. We both have the 9th generation iPhones - and seem to be in agreement that its been a solid upgrade to the 8th generation phone. Similarly to you, i found the 8th generation iPhone underwhelming but that was mostly because the 5s set a very high bar.