I'd say it depends on how tied into Apple's ecosystem you are and what you're looking for.
I have an iPad and MacBook, but despise iPhone. the main reason is I have OCD and I like things a specific way. for example, each app has its symbol and the name below. I only like the symbol, the name below is ugly IMO and useless. Android I simply install a custom launcher and set it to my liking, iPhone I'm stuck with it.
obviously that's just an example, but you get the point. Android is so much more customizable and if you enjoy tinkering around with your phone, you'll like it.
If you're used to Apple's ecosystem across the board, you're not gonna get the same experience on Android. There's just a lot more moving parts so it's not as fluid. It's definitely manageable though. I have two Android devices, the Macbook and iPad, and a Dell xps and things work just fine.
As far as the S6, I'm sure you've read the reviews so you know it's a great device. Some people have had some issues, such as the home button rattling, but just like any device that sells by the tens of millions, it'll have a few issues.
If you're up in August, you might want to see if the Moto X 3rd Gen is out. Personally I'm looking forward to it. The knock on last year's model was a bad camera and battery life, but everything else, especially the UX was money. Rumor has it the battery will be significantly upgraded, as well as the camera. The battery I believe, the camera I'm not so sure. Moto has never had much success in the camera department and I think it's safe to say it won't compare to the S6.
Good luck.
Posted via the Android Central App