"If it's not broken, don't fix it" is a wise and popular mantra among anyone who fixes anything. Developers, on the other hand, couldn't care less. Enter SuperSu. While Superuser has been a staple of root usage for a long time now, XDA developer Chainfire (who has also brought us many other fantastic apps), has taken what already works and made it even better.
SuperSU performs the usual tasks of managing superuser access, with a few added benefits, including logging superuser access, temporary unroot, and it even works in recovery.