Mahlers 5th is good, but I think his 4th is better.
But my personal favorite is Beethoven’s 5th. I used to HATE that symphony when I was a kid, my grandmother loved it and it bored me to tears.
Turns out the version she had on CD that she always listened to was the worst recording you can find of it. It was WAY too slow, it made the whole thing drag on. That symphony works best when it’s damn near rushing. When I got back into classical a few months back I found the Berliner Philharmoniker playing it directed by Simon Rattle, and the sprint through that symphony, and it works SO MUCH BETTER. It was very clearly intended to be played fast, so many of the parts feel way more interesting and there’s sections where each part of the orchestra feels like it’s tripping over the others to be heard.