It's nice to read that someone understands the awesomeness of the notifications on iOS! Like you, I've had all the iPhones except iPhone 5s. I'm currently on a Nexus 5, which I found that I like better than the Moto X, but that's another thread.
I always found it hard to go to android from an iPhone. One reason was how iPhone shows you the notification, bam, right there on the screen where you can actually read most of it and not even have to touch the screen. I always have twitter notifications coming in while I'm at work. I have my phone propped up in front of me. When a notification comes in, I can read it without having to touch it, which is awesome. It confounds me as to why android doesn't even light up the screen an all when you get a text or any notification! Anyways, like I said, I have the Nexus 5 and I briefly had the Moto X. So, when you get a text, for example, on the Moto X, the screen lights up but it only shows the text icon. You get no preview of the actual message. So, you still have to hold down on the icon to read some of the actual message, which pretty much defeats the whole point. Now, this is a little better than other android phones, but still not ideal. But after a ton of searching, I have found an app called Notifier Pro that kind of duplicates how Apple does notifications. I set it up and now I get the screen to light up and it shows some of the message without having to touch the screen. When I got the Moto X, after a short while of having the "active notifications" on and getting annoyed, I installed the Notification Pro app, and it worked like my Nexus (with the app). But, that just showed that the active notifications on the Moto X wasn't cutting it. I found that I was just making it work like my Nexus. So, I returned the Moto X and kept the Nexus, which has the better screen, newest android features and the smoothest operation. So, with the help of this app, in addition to a real notification LED, I have the best of both worlds.
Now, I did like the always listening thing, where you can say, "OK Google Now" at any time. That was a cool feature.
As far as the question of whether you should get this phone over your iphone 5s, only you can decide. If you are like me, I have to try things for myself because I have found that a lot of things that people like about phones is completely opposite of my way of thinking, which is fine because everyone is different and entitled to their opinions. I hope this helps.