Help name a book

Question on title of book. So, I'm having trouble deciding between two titles so I'm asking for help from my readers. The Series is The King of Prey. The current and upcoming books are (in order) King of Prey, A View to a Kill, Master of the Hunt. Another unreleased one is titled Prince of Flight. Another I still need to iron down a title. I have to give the info to the cover artist for the series. I'm torn between Thermal Rising and Rise of the King. This is Lazar's book (for those familiar w series). Thoughts?