I don’t have iOS so SmartRules isn’t available for me yet. SmartRules is new and has lots of potential to grow. I still use Rule Machine which was not only FREE for all but was absolutely the most powerful app out there… not perfect but extremely flexible. The problem with Rule Machine now is it was recently removed by the author after the troubles that SmartThings has having.
However, there is one currently in development by @ady624 called CoRE (Community’s Own Rule Engine) which looks simply amazing and has the potential to fill the gap Rule Machine left. Here is the thread while it is in alpha development and I am impressed with how fast ady624 is cranking it out.