Bayer must lose at some point, and Bayern will be a very suitable opponent for this. Yes, this will be the decisive match in the confrontation between these teams, especially if Bayer wins, then they will be able to get a very good advantage, and everything will depend only on them. But Bayern have much more experience in such difficult matches, so I would give preference to Bayern in this match.
Leverkusen is currently only 2 points behind Bayern Munich. So if the Bayern Munich team can beat Leverkusen then Munich can occupy the top spot in the table. But I don't think Leverkusen will lose this match. Leverkusen are in very good form right now. And the important thing is that the match is Leverkusen's home match.
Leverkusen's players are able to score a lot of goals, as well as the team's defense is very strong. This team conceded only 14 goals in 20 matches. So it is a tough task for Munich to get 3 points against Leverkusen in an away match.
Bayern Munich and Leverkusen have played 20 matches together, so the battle for the standings will be even more interesting and this also requires Leverkusen not to lose points in the next match. For a difference of 2 points, I think Leverkusen still has a slight advantage but is not completely safe because Bayern Munich can be aggressive when the points are close. I want both of them to compete until the end of the season, on February 11 the big match between the two will be a spectacle that will attract attention as proof of who deserves to win the trophy this season. The BayArena Stadium will be a witness where the two clubs will determine their respective qualities, whether Xabi or Tuchel is effective in their strategy.