I'm late to the game but I have been a lifelong Apple phone customer. Last one was a Iphone6+. The last two I had died right after the warranty was up.
It's too hard to get an appointment at an apple store and I really didn't like the IOS so I switched to Android.
I wanted the Google Pixel XL but there were none to be had so I opted for the Galaxy S7 Edge.
People say it's difficult moving from Apple to Android but I found it seamless.
The Google Pixel has some nice features like unlimited cloud storage and Google Assistant not to mention the reviews show its a nice phone for taking pictures.
Since you carry your phone in your pocket, the 5.1" may be better for you.
At least you have a couple more weeks to make the decision to return your IPhone or keep it.
I'm on day 1 of a Pixel, coming off of a Samsung S5. My wife got an iPhone 7. The Pixel is great so far. Kind of a cross between a Samsung phone and an iPhone. It has all the good stuff from Android, with a clean interface like an iPhone.