The Dark Side is Stronger

So you want to know if the Dark Side is stronger or the Light? We were all thought to believe that the good will always triumph over evil. Yoda explained to Luke during his training on Dagobah that the Dark Side is not stronger, but just easier and more seductive. Of course, no one would admit the opposite side is stronger and chance that being temptation to be more powerful. Even George Lucas in the past makes fans believe that the Dark Side isn't stronger. BUT, I did some digging and found behind the scenes footage where Lucas admits the Dark Side IS stronger!! So Yoda and Lucas were both holding back. What do you think about this? Star Wars is a little different when Lucas changes his mind each and every day about something.