'Just works' is about all you need to know. Before the S6 there wasn't an android phone with a great camera, good screen, premium build and buttery smooth experience. S6 hits on most accounts, but the experience still isn't buttery smooth. My GFs Moto X 2013 runs smoother than my S6 in most user interfaces.
iPhone has always had the best overall experience, and that's what most people don't get. You saying your old touchwiz devices are comparable to IOS is pretty laughable. TW is notorious for being laggy and awful until maybe the past year. You'd have to pay me to use a Samsung before the Note4/S6.
Market Data 
Markets 
AI
