Real Madrid should win this particular game, this particular season with these squads 999 out of 1000 times, if it's in the Champions League. If Dortmund were to snag a win here, I'd be surprised!
Even the bookmakers are tipping Madrid for the win, on Duelbits Madrid has just 1.62 odd compare to Dortmund 5 odd, even a draw isn’t seen as a realistic chance in this game. Anybody going for a Dortmund is just doing it for gambling sake and not related to the football both teams play.
Even with luck it my still be hard o defeat realmadrid especially in finals, not that they are good in strategists their game play only but also good in fast game playing.
Most crucial games like this, realmadrid are not always after possession qt all although they were never after possession before but the level is always different games , they are always after securing goals and there's on thing they never give up even at the last seconds unlike psg who easily lose hope when they are one goal down and that was what made them won Bayern...
Winning is already on higher scale for realmadrid, although I do believe in luck
that 5 odds will go along way for bets 
.Realmadrid will definitely crush Dortmund on comparison
