I think both home teams are clear favourites, possibly the odds for Milan to win and for PSG to win are quite generous. It wouldn’t surprise me if one of those games is a draw. Leverkusen do concede goals, their last minute winners will not continue forever, logic says so.
When magic ended, Leverkusen lost their first match in this Bundesliga season. Magic like last season, to help them scoring very late goals and avoid defeats, hardly repeat in this season. AC Milan with their experience in Champions League and with a latest won derby against Inter Milan when they were considered as a weaker team, will be able to exploit Leverkusen's weakness in defense and get not only a draw, but a win from the German club.
Arsenal have no real pedigree in the CL so maybe PSG have a surprise for them, although no Mbappe has lessened their attacking threat.
Arsenal will meet a strong opponent in Europe, PSG, but they have good defense and can block PSG attacks or counter attacks. In Arsenal attacks, they have diversifying options and can score winning goals from corner kicks. Latest matches show that Arteta prepared different tactics for Arsenal from attacking to defense and his team can score goals from free kicks or corner kicks too.
PSG appear more regularly than Arsenal in Champions League but in this home away match, they have big risk to lose it to Arsenal.