Alphacat

I know for a fact that Luna is more powerful than Celestia. In the time traveling episode it shows that nightmare moon/luna have defeated her sister and had rule over equestria. We see that celestia even fear her sister when Sombra show her the vision, now this is a made up episode but for me it still counts. Celestia has lost against both Chrysalis and Sombra. She's not that powerful. And those 1,000 years where spent in crying and wishing Luna was back, she says so. Luna on the other hand is way more powerful, she almost destroyed the world, three times. She has defeated Sombra, cut his head off. She would have defeated Chrysalis but that wasn't Hasbro plan. She's younger, faster, agile, stronger and even wise. Her ability to control dream and reality is on par with discord, although at a smaller scale. Seriously my fellow ponies. Luna win, hooves down.

I personally think that Luna is more stronger than Celestia. Although this is canon the battle between the two sisters Vs Sombra. Luna won, Celestia would have die. So Nightmare Moon Vs Draydreaker is a no brainer. Nightmare Moon win. But...I could be bias because I love Luna. But come on, Celestia lost against Chrysalis and Sombra. So this should be proof. Nightmare Moon win all the way!!!