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Common football fans probably favor Real Madrid to win the match. People know well which team has better players and has incredible history in UCL final. That's why people call Real Madrid as the king of UCL. But this can't guarantee them to win UCL, Real Madrid must do a serious effort if they want to beat Dortmund. The status of King UCL and good records in previous finals won't bring real impacts in the field. It finally depends on how Real Madrid players can play with their best level.
It's understandable that neutral fans put Real Madrid as Favorite, they are an ambitious team whose have standard of winning trophies every season. Their mentality in Champions League is unmatched, they would always to win even though they were not favorite in some circumstance like when they beat Manchester City, and they always find the way to achieve it.
What will happen in the future is not known by anyone, but it's normal to make prediction. Dortmund is also not a team that was predicted to reach the Champions League final, they were even struggling in their own league. Spirit to win a trophy and redeem last season dramatic failure will make Dortmund play the game like it will be the game for their life. I'm sure the game will be an exciting game with intensity and determination.