That I am not sure of. But when I had the Note 4 and the S6 came out the TW version were a lot different. The S6 version was nicer. Would have been nice to have it pushed as an update.
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I am not sure about that....why would the 6P run better? The hardware will still be the same. The S7 will be running marshmallow or the next upgrade from that seeing it is 2 years away. The 6P will have the latest Android version no doubt but that doesn't guarantee it will run better.
Look at the Note 5 and the 6P now......
N5 camera is better and the camera software is better...that won't change btw
N5 battery life is better even with TW and the 6P running stock Android.
N5 will still have more features even two years from now.
The 6P will always get the latest Android...but the S7 will get it too...just a lot later