I tried it and got the Galaxy S6 Edge. Absolutely loved the hardware. 5.1 screen size is perfect IMHO. The phone is larger than the iPhone 6s but easier to hold on to. Screen itself is beautiful. The "Edge" screen is a bit of a gimmick but it does give you a feeling of immersion into the content on the screen that is really fun. I love the haptic feedback when typing and the little things about Android like the way it predicts what you want to type like email addresses that you regularly enter.
Having said all that the rest of the Android OS is an absolute mess. Everything feels so disconnected and not very well thought out. I have to say it would be a better experience without all the Samsung bloatware as I found none of the Samsung additions to be of any use. I never quite got a handle on the email experience as I was trying to find a great email client that could easily handle both an iCloud and Exchange account and I never found one. This is so simple to do on iOS. Another oddity was the Play store. I would regularly install apps from there, watch them download, then finish, but instead of the button changing from install to open as it does on iOS it would change from Install to update telling me that the app I just downloaded would have to be immediately updated. Why am I downloading an out of date app?? Shortcuts to apps look just like apps so new users probably have no idea if they are moving or deleting the app or the shortcut to the app. The general feeling I get from the Samsung/Android OS is that little thought was given to how the system works together as a whole. Pieces of the OS and apps that you expect should know what each are doing, don't. It's like they exist in separate systems.
Ultimately I'm too deep into the Apple ecosystem to switch to Android anyway. I've gotten all my family and friends on iPhones so not having Messages would be a deal breaker. Not having Airplay would also be a deal breaker for me. I've got Apple TVs all over my house and it's so drop dead simple. Lots of nice hardware on the Android side and some very cool Android OS features but I would be giving up too much by switching
You locked yourself into Apple's ecosystem and are digging for reasons to blame the other Software, when it's not the issue.
The issue is no Android phone is going to meet the mark because you have too many Apple devices. They only work that well with each other and with Apple's services.
Samsung's Software exists for a reason, and it's all consistent with their design ethos. The only thing inconsistent on TouchWiz devices are Third Party and Google Apps. All of Samsung's Apps share the same design language, and if not for Google's mandates, they'd let you get most of that from the Play Store. Just cause Google Runs Android does not mean their Apps or Design "philosophy" (which many people absolutely hate, by the way) run the design and development department of every OEM designing Android devices.
Furthermore, a lot of what you download apps for on iOS (Outlook for iOS, Camera+/ProCam 3, VLC, etc.) is built into a Samsung device. That's an additional reason why their software has to be there: because they don't develop Google's software. A lot of duplicative third party apps make their name on iOS, because iOS users are typically looking harder to replace the defaults than Android users, where a larger majority of users (relative to the install base) are fine with what comes on the phone.
Samsung cannot give you better CODEC support out of the box on their phones without giving you better media playback apps - they cannot modify the code for Google Play Music or Google Photos. They can't give you Exchange Support because they can't modify the Gmail and Google Calendar Apps, and Google doesn't give that away to non-Nexus Phones because they don't want to pay the license fee for all of Samsung, LG, Sony, Motorola, Asus, etc. device sales.
Android is developed and distributed differently than iOS, so it's sort of an Apples to Oranges comparison when you compare the two like that, especially when you don't rationalize it with legit reasons why things are the way they are.
Apple just fixed an iOS App Store issue that causes users to be unable to update some Apps from the App Store - so those types of issues happen on both platforms as well as on Desktop Platforms with an App Store like OS X and Windows 10.
Samsung cannot integrate that way with applications they do not develop, so don't expect that on any OEM Android Phone. Apple can't do that on iPhones, either. Developers have to Opt into that, otherwise it does not work (i.e. App Updates to enable "Spotlight Search" are no different than App Updates on a Samsung Device for a Developers to enable "S Finder" In-App Search Support).
If you want a closed system that has everything developed by one entity then you need to look at iOS, Windows Phone, or a Nexus device. However - all of those share the same issue where missing features in the base distribution means you have to go on an App Store hunt for a suitable replacement. OEM Android devices are going to have that handicap ("issue"), always. It's a result of the way Android is developed and distributed, and it's never going to go away unless Google makes changes to the way they can integrate these things into the OS and allow other apps to access them, among other things.
The issue with ecosystem investment and the device not fitting in is a personal problem and would happen if you had non-Apple devices and then tried to introduce an iPhone and Apple Services into the mix ;-)
P.S. The Edge screens are a gimmick. They cost not that much more to manufacture but the phones retail for about $100+ more than the non-Edge versions. It increases their profit margins. They do look nice, which I guess is helpful to Samsung.
iMessage is nice, but not nice enough for me to really care whether or not I use an iPhone or anything else. Other factors weigh more heavily in that. It's not much different than SMS/MMS and most of the people I know with iPhones have "Read" turned off on their phones for obvious reasons.
However, I'm the type of person that diversifies purposely with the full intent of avoiding locking. I move mobile platforms on a near yearly basis and being able to do that without worry that it will cripple workflows or usability in other areas is - for me - liberating (technologically speaking).
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