Multi-window
Edgescreen shortcuts
Samsung Browser with adblock
Built-in Theme Engine (Hello dark mode)
Change Media volume by default
Dual Apps (launch to apps at once in splitscreen)
Smart capture
Hide nav bar
Adapt sound to personal preferences and headphones
Game Launcher is surprisingly effective
KNOX Secure folder
Dual Messenger (use two messenger-accounts)
Floating camera button
Swipe to call or swipe to message in contacts
Auto muting games when launched, but can still use media volume for other things
Multi-window is introduced in Nougat already.
I just mentioned how crappy the Samsung browser is in another comment, because for some dumb reason the history is hidden inside the bookmarks tab. There are umpteen options to block ads on phones, including un-rooted ones, these days.
Only the theme engine and secure folder are good features. The rest are crap. Swipe to call? Really? Don't you think you're clutching at straws? lol