I admire Arsenal's performance in the Premier League. I haven't anything to say against that. They are even the most scorer team in the league in addition to their being the leader there now. 
But we don't see the same team in the Champions League. I assume you would agree with me on that as well. We can't say their performances here so far have been very consistent. We have all seen how much they struggled against Porto. There is still a point that they can benefit from though. Bayern Munich's performance in the Champions League hasn't been amazing either. If Arsenal manage to make big difficulties for their defense then things can get really interesting.
Arsenal in the Premier League has indeed performed extraordinary, they are able to lead the standings with their good record this season. Well, in the Champions League, of course they also have to be able to perform better because at each stage the opponents they face become increasingly difficult. In the quarter-finals, Arsenal will face Bayern Munich, where Bayern Munich is the team that is quite the favorite to become champions. This match is a big challenge for Saka et al because if they succeed in beating Bayern Munich, the mentality of Arteta team will certainly be stronger to visit the Allianz Arena in the second leg.But we don't see the same team in the Champions League. I assume you would agree with me on that as well. We can't say their performances here so far have been very consistent. We have all seen how much they struggled against Porto. There is still a point that they can benefit from though. Bayern Munich's performance in the Champions League hasn't been amazing either. If Arsenal manage to make big difficulties for their defense then things can get really interesting.
In terms of experience, of course Bayern Munich is superior to Arsenal, but in terms of ambition, Arsenal may be the strongest this season. The first leg will be an important match that Arsenal must win because it will make them more confident when playing in the second leg.
This is what will make Bayern Munich take their Champions League matches more serious to make sure that they advance to the semifinals. Arsenal are weak when it come to UCL matches, and Bayern Munich is strong when it comes to UCL matches due to their experience. This makes me to doubt that Arsenal will be able to qualify to the semifinals. Bayern Munich are very dangerous playing at home. Bayern Munich is not Porto that they struggled with and qualify with a penalty shootout.