I can never really leave Android because I consider myself a vagabond when it comes to different brands. I like hopping onto to different brands to try. Variety is the spice of life like they say. And Android just has more different partners which means using their custom skin/ROM could be a totally different experience to me altogether vs a prev Android. Fresh new ideas get formulated. Last year, LG gave us Knock-On and HTC followed suit. Sony went water-resistant for a flagship and Samsung followed suit.
With iOS, it is just Apple. You get stuck using one brand. One company. More limiting ideas. Stagnant. Stale. My next phones might be LG or Sony just because I never owned a smartphone from them. I've owned many Sony products including a Sony Ericsson T616, but never an Xperia smartphone. That is why LG G3 and Sony Xperia Z2 are on my radar. Perhaps even an Asus, Meizu, Gionee, or Oppo/OnePlus. But after awhile, it does get redundant too. But not as quickly redundant like on iOS/Apple-only products.