The best texting app in the iOS App Store is (for the moment) free.
I’m a fan of the impressive Launch Center Pro, a time-saving app created by the same developer who makes Group Text+.
Group Text+ makes sending texts to a pre-saved group (or individuals) really easy and fast. Much quicker and more natural then trying to compose a group text in the native Messages app. And Group Text+ comes with a bunch of funny gifs you can use.
Check out the app here–free, for the time being.