Atletico Madrid is a tough opponent for any big club in Champions League but by understanding Real Madrid very well, they are one of most unwanted opponents with Real Madrid. Similarly Bayern Munich did not want to play with Bayer Leverkusen in Champions League too but destiny attracts them playing against each other.
I think both pairs are hardly predictable as Bayer Leverkusen and Atletico Madrid even can be considered as weaker but not too considerable, and they are able to play outstanding matches to beat stronger opponents like Real Madrid and Bayern Munich. Personally, Atletico Madrid have better chance to win than Bayer Leverkusen.
Both teams have another opportunity to one up the other when they meet tomorrow and another thing about Atletico Madrid is that their mentality have changed ever since they played Bayer Leverkusen, win has always been in their eyes and I see them as a more stronger side than Madrid like these guys can defend and at the same time play a very fast counter attack and Madrid looks like the soft side in this game.
For the German teams I can't say but Bayern Munich doesn't look strong in the champions league because if they are strong they would be finishing in the top 8 teams in the champions league table but they couldn't qualify and we thought they would have gotten that free passage to the next round. Both teams are familiar with themselves and this is the 3rd they are meeting this season, we should be ready for a block buster, a game with so much attack and defending. I'll still go with Leverkusen if I'm to predict in that encounter.