Simply because everyone knows that the Power Rangers are nothing more than a cheap knockoff of Voltron designed to corrupt today's youth into believing republican propaganda. The Defenders of the Universe will break the wimpy Power Rangers any day. The Power Zord has a big floating head and a little neurotic robot backing it up. Voltron has an entire planet of people who all love Voltron, along with an intergalactic Prince and his small fleet of war ships. Voltron will standing over a steaming pile of Power Zord parts within 5 minutes.
Nothing can beat the power of the elements.
Nothing can Beat Voltron. Voltron can, and will destroy that Mighty Morphin' paperweight. I have always hated Power Rangers, and I have seen how Zord is so pathetic. So I say Voltron is my hero for this battle. Besides, the 5 lions will take on any incarnation of those wimpy power rangers.