Re: So, I'm back and forth again with iOS.
With Android, it's easy to determine which app or process is consuming battery. With iOS, it's a hunch and guessing game. Recently on 7.1, I left for work at 100%, only to glance down an hour later to see that battery level had plummeted to 70%. After searching around, noticed in the Diagnostics Logs that the native mail app had crashed about an hour prior to the plummet. Likely that process didn't exit and continued chewing up way more battery than normal. But no way to be sure.
On Android, the default Battery app provides easily accessible and understandable information about which app or process uses battery. Want more details? Go with an app like GSAM.
So, if battery management is a concern, I'd lean toward Android in that case.