My prediction for this game is very difficult, I agree with you that this athletic match Madrid vs Real Madrid will be very difficult to predict, both teams are willing to win, and then you know the derby is the most important game in the championship, and when this type of matches happen during the Champions League groups the matter becomes really interesting, it will surely be a nice parity
With a very thin goal aggregate between Atletico Madrid and Real Madrid that has occurred in the first leg of the Champions League this season, there is indeed the potential that the second leg match later could be even more fierce than the previous one at Atletico Madrid's home. But almost everyone knows that Real Madrid still has more fit players who are often used in any competition this season, of course the Atletico Madrid team must be more careful with Real Madrid in the second leg, because it is a real opponent that is quite difficult for Atletico Madrid to beat.