For Arsenal to get a draw while playing at the Emirates Stadium is actually quite bad. Because they know that in the second leg when they play at their opponent's home ground, namely at the Allianz Arena stadium, it will be more difficult for Arsenal.
Seriously Arsenal was suppose to win the match, Bayern Munich which they played against haven’t really been performing well in their local league, they lost their last two matches before they played against Arsenal, and since they played at Emirates stadium, they should have just taken advantage of that and win the match, but they ended up playing draw, when Arsenal visit Bayern Munich at their home, the match is not going to be easy for Arsenal, and Bayern Munich will do everything possible to win the match, seriously they bought have equal chances to win the match.
But you should be aware that the results of matches in the domestic league will never have any influence on the team performance in other competitions such as the UCL.
Maybe Arsenal, who performed optimally in the Premier League, is the basis for the assessment that Arsenal is stronger than Bayern Munich, especially since this match is Arsenal home match, but this is the UCL and all teams will definitely give their best performance.
Bayern Munich is already quite far behind Leverkusen and it is impossible to wins the Bundesliga so Tuchel is focused on the UCL match, he made all his players stay fit in the UCL and this was all proven by great performance in the away first leg against Arsenal.
I think that Arsenal will fail in the UCL this season and the only chance they have is to become Premier League champions considering they are currently at the top.
In the next match for the second leg against Bayern Munich it looked like Arsenal would lose and they would be eliminated in this quarter-final round.