Just finding a new smartphone the size of an iPhone 4 may be a challenge. Manufacturers, even Apple, realized that a large portion of those who buy smartphones are physically larger than your average adolescent, and don’t all have the 20/10 vision required to comfortably read a 3.5” screen. Accordingly, the trend is towards phones in the 5” range (iPhone 6, Moto X…), with 4.3” screens like the Droid Mini for the more petite. In fact, unless you are willing to go for a larger phone, the Droid Mini really is your only choice.
Large variety of cases pretty much precludes most Android phones in the first place. The only real exception there is Samsung, but their phones are not exactly durable without the case. Motorola phones have fewer cases available, but I’ve had my Razr HD for >2 years with no case and been fine; most current Motorola phones have a Kevlar back, and Gorilla Glass face. I’ve dropped mine 6 feet onto concrete and it didn’t even ding it.
If you are an iOS-lover, you are pretty much stuck with the iPhone 5/5s.
@hominid @seekingwolf I had almost the opposite experience. My wife and I hated our iPod Touch but liked our Droids. Unlike me, a demanding geek, she is just an average person with no real computer knowledge. Truth is, iOS and Android are similar enough that the only way that it could be frustrating is if you are certifiably afraid of change.