4a is a great choice. I think you'll be happy with it. The Samsung 10e is another similarly priced device. I think the Google photos integration is really nice. Even though the Google photos app drives me nuts sometimes.
I am a lifelong android user. I almost switched to iPhone during the 5 era because I loved the form factor of those solid metal edges. When iPhone 6 came out with the "Samsung esque bar of soap" I was shocked and disappointed. I think iPhones today are sooooo slippery! The iPhone SE is a really attractive device, but I am pretty deep into the android ecosystem at this point and have disapproved of a few of apples decisions. It's funny to me that companies keep copying the worst parts of each other's designs: the slipper bar of soap rounded corners, the notch, the removal of headphone jack and USB A...