Touchwiz is that thing that some people hate. It has come a long way in the last couple years and for me works great.
Part of the problem is the reviews you find on youtube and other places, reviewers making comments like "it still comes with touchwiz and not stock android".
They make it sound like a bad thing, but to be honest some people dont want stock android, they want features made into the phone without having to download extra stuff. Touchwiz is samsungs android system, its their product on the device.
I have had near stock android, and the thing that draws me back to samsung is the way they have their devices set up out of the box. Its not perfect, but to be honest i would prob shy away from samsung if they went stock android.
Touchwiz seems to be that thing it's cool to complain about, but touchwiz has come a long way the last couple of years and isn't near as bad as some people try to make it sound.
Sent with my white Note5 with nonremovable back and no SDcard!