I tried the 6S plus just to see if I could switch and stay with VZ. Returned it. Safari is a truly horrible browser, which is a tool I use daily. Well after coming from IE11 and Edge I felt like swimming in molasses with Safari. And other browsers like Chrome are just an interface to the same required base browser engine that Apple requires as the only IOS option. Figures. App selection is nice but didn't find any of the ones that I use on Win phone to be any better on IOS, despite expecting they would be. Missed tracking individual mailboxes and folders on the start screen. I have folders for Helpdesk and personal all on Exchange and I don't need to be "looking" into the mail app every time the counter goes up to just see if I have relevant emails that need attention.
I guess IOS works for many so if you love it - enjoy it. Some things were nice but key things I use every day were just not for me.