I myself use an iPhone 6 (after upgrading from my first iPhone, a 5s). If you own other Apple stuff (I.e. Macbook, iMac, Mac Mini, Apple TV, or iPad) then get an iPhone. If you don't own other Apple stuff, then I still think you should get an iPhone.
There's waaaay more Malware for droid, and while both droid and iOS devices pretty much have an expiration date, iOS based devices generally last longer (both in hardware and software). The apps for iOS are just plain better. There are better apps available on the app store from more publishers and apps tend to run better for iOS. Also, Apple uses Samsung as one of their main suppliers for their flash storage AND screens which I like (I use and love Samsung's SSDs, monitors, and TVs) except Apple helps design it exclusively to work with their software and other hardware components. Apple is also in talks with Intel to make processors for their next iPhone iteration (theoretically the "iPhone 7") which would give an even better boost to both performance and value.
I also own a Droid based Nexus 7 tablet. It's much older than my iPhone 6, and I'm glad I have it, but that's a fun toy I love to F with. My iPhone is an essential tool that I rely on.