I'm an iPhone guy all the way, but I think you're thinking about the way things were in 2012
Google Play and Amazon offer the vast majority of apps you'll find in the App Store, and what you can't find can usually be replaced with a decent alternative. And multitasking on large android phones is pretty slick. Being able to use two apps on the same screen is something I'm really looking forward to on the iPhone one day.
Having said that, I stick with iPhones because of the ecosystem. There is nothing on android like iCloud, and for all its warts, iOS just works better for me.
The S6 looks like a fantastic device (maybe because it looks really familiar
) but I just don't know what's going on with Samsung. I think they consistently put the best displays on their phones...I freaking love their screens, but everything else is mostly a head scratcher (Touch Wiz, water proofing the S5 and not the S6, taking away expandable storage/battery swapping). It's like everything they do is an attempt to one-up Apple and other competitors....throwing a half-baked finger print reader in, making a metal body at the expense of being able to swap out internals, the Galaxy Pay service (we'll see how well that works I guess). It's like they just throw everything possible into the phone to see what sticks. No rhyme or reason, no cohesiveness, just a random assortment of features.
I don't always agree with everything Apple does with the iPhone, but they have a consistent design language and are very methodical. I know the next iPhone is going to be everything my current one is and more. You can't say that about Samsung.