We all know the 6s+ to be a very capable and slick phone. But to compare it with the 7+ which has a better processor and an extra 1Gb of ram, I would say the 7 Plus is significantly smoother and slicker than the 6S+. I could straightaway tell the difference after I started using my 7 plus even though both are on the same version of Ios. Opening and closing of apps are quicker marginally. i could leave more apps running in the background. And of course, the new home button with its haltic feedback does feel a lot nicer.

Camera is much better. Waterproof is a neccesity now.

My main complain on this phone would be the same boring design from iphone 6 era till now.  To me, Apple has just become to complacent to bother. The jet black  colour made me upgrade. Damn Apple!

the clue is on 6S/6S+ box, coi fish
the A10 perform much much faster to me you are more like trying to collect feedback and convince yourself not to upgrade lol

if you have "extra" money, upgrade, if not, wait next year so simple, why need people to tell you any good for upgrading? since you already knew it and try to answer it yourself

anything people mentioned 7/7+ is better you trying to counter it back, how can you compare a DSLR cam to phone? thats nth to compare... well, you have a phone now, continue using it... no need upgrade

Let's me share my thought why I upgrade iPhone every year since 9 years shop from iPhone 2G. Everytime new iOS out, older phone definitely will not be as fast the flagship phone for sure, if you are particular user like myself who really care about performance yes you wanna update. Besides even you pay for 1k+more to upgrade your 7 will worth 1k more than 6s in a year later. Most important the new phone has another year warranty from Apple but your existing may not. That's my justification to upgrade yearly.