User blog comment:Ffejgao/Mumm-ra vs Skeletor/@comment--20150630054310

After taking in all the info from the bios above and reading about both, I have to say Skeletor is going to win. While both have never really accomplished their true goals in life I still believe Skeietor is more powerful. Sure Mumm-Ra has the the Ancient Spirits of Evil on his side even with that great power he still loses constantly and he's gonna lose agian today. Skeletor's havoc staff and dark arts are far more impressive than anything Mumm-Ra has, at least in my honest opinion. Also Skeletor defeated the entire Justice League and turned them into his personal minions.

With that I am going to say Skeletor has this battle, final answer.