Having just, a few Months, moved to an Apple 6S phone from a long time Android usage (Mainly Samsung and Sony) I find that the best thing with the 6s is it just works out of the Box.
A few simple settings and Hey Presto, not multiple settings and wondering if you will get what you want. Reception is better, Camera is fantastic, onboard Camera App is pretty good, etc.
Had a few Samsungs hoping they were going to get better but actually they got worse and nearly drove me mad, preferred Sony Android Version but the last Phone had dreadful reception problems.
So Apple from now on for me, the few Android advantages listed are not that important, for something that works.