Apple iPhone 6s Plus feature highlights:
iOS 9
Pressure sensitive display called 3D Touch.
Front camera has flash called Retina Flash.
Rear camera can shoot Live Photos.
Has 128GB storage option.
Samsung Galaxy Note 5 feature highlights:
Android 5.1 Lollipop.
Quad HD display.
Has a built-in heart rate sensor.
Comes with a stylus called S Pen.
Has Qi wireless charging capabilities.
as I can see from the specs and feature highlights above, both smartphones are powerful and solid in their own right. As for which one should you get? That totally depends on which platform and ecosystem you are tied into. Also since both smartphones are brand new, with Note 5 being released and iPhone 6s Plus released any phone you buy now should easily last you two years. Really, you can’t go wrong with either.