You aren't seriously comparing Real Madrid whom over the last decade in this competition have found ways to win more knock out ties than they lost with Arsenal who showed last night why it's been a struggle for them to reach the last 8 of the champions league for the last 14 years. Its 15 years since they reached the semi final and 18 years since they reached their one and only final. Good luck to anyone that wants to part with their cash on them.
Useless comparison for both sides as players who were part of those teams aren't there anymore, or few have remained in the case of Madrid. I don't see how 2009 Arsenal has anything to do with 2024 Arsenal. Or 2014 Madrid with 2024 Madrid. Or even 2018 Madrid.
Sure, experience can be a factor for both teams, as I mentioned yesterday in regards of Arsenal struggling vs Porto, but in terms of talent and ability, they are still one of the best teams left in the competition.
Did Madrid play at their best vs Leipzig? No. Did Arsenal play at their best vs Porto? Also no.
Saying that they are unlikely to make it through the QFs, though, is nonsense. They'd be favorites against every team bar City, probably Madrid, and maybe Bayern.