Quadratic Vertex Word Problems

Adam and Sarah decided to build model rockets together. While building these rockets together Sarah and Adam decided to have a competition to see who's rocket would fly the highest. Sarah and Adam choose to launch these rockets at the same time. The trajectory of Sarah's rocket can be expressed using the following equation: $y = -15x^2+x+19$. Adam's rocket's trajectory is $y = -13x^2+6x+18$. What is the highest height reached by either rocket?