I have both Apple and Samsung's flagship phones. Insofar as the camera is concerned, for normal users, I would say both are just as good. So, you have to consider other factors before investing in another phone.

Just buy and use.

If got problem, 1 to 1 replace 

Now Night Shift can be turned on even when Low Power Mode is on.

yes, that's halo effect. The glass is not perfectly flat. No other options except using normal screen protector. I bought 3 different tempered sp, all cannot pakai. 

Can try the usual famous one.

Imos, Spigen and etc.

Most of them works fine but if you're using Imos, be prepared to lose out on casings as not many casings can fit the thickness of the IMOS.

Mine is ETC tempered glass which I got from Mac City.  The staff applied for me when I bot my fon there.  Seems ok so far

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Sama sama...

Btw, ayam not bro

Your phone is curved more at the edges causing this issue. Not all iPhone 6S has this issue as not all phones are manufactured equally. You can try those full coverage tempered glass (3D, edge-to-edge etc) which might work. I mentioned might because some iPhones are curved too much which the full coverage tempered glass can't do much as well.

curved very sexy 

I have two 6S. One of it has no issues at all with tempered glass while another one could not stick at the edges. Upon closer inspection, indeed it was pretty obvious that it curved more.

yes , if people told you what model is that , iphone 6s edge