I just purchased a 64GB iPhone SE for my wife yesterday and I've played around with it for a good bit (last time I used an iPhone was a 4S back in 2012). One striking thing I noticed immediately was how great the standby battery life is compared to Android phones. Even my Nexus 5X with 7.0 Nougat and the improved Doze cant match the iPhone's standby. My GS7E fares even worse.
With that said, however, the SE's battery drains at about the same rate when the screen is on & the phone is being actively used.
iOS has gotten much better since I've last used it but it's still too restrictive for my tastes and not as efficient in multitasking.
She uses the iPhone when she goes out and uses her Note 4 when at home.