Samsung doesn't enjoy being thrashed around by Google making countless sub versions of Android and adding tons of UI updates years after they've made them. OEM's like Samsung must choose to either be horribly behind Google or jumping the gun and having an ecosystem large enough to rival Apple's. I've switched to most Samsung products over Apple and it's amazing how much easier my life has gotten.

Samsung really nails the UI of their phones and the experience makes stock Android feel like a buggy unfinished mess.