I think Abbado's M5 is a tremendous performance. Two thumbs up!
IIRC, this is the first of two recordings of the Fifth that Abbado made. I've never heard the second version.
Bernstein's Mahler is definitely EXTREME. But I love it. Bernstein's VERY exaggerated Mahler Ninth (on DG, with the Concertgebouw) was my entry point into Mahler's music -- so I'll always have a soft spot for it.
That said, I also love other ways of approaching Mahler too -- by conductors like Bruno Walter, Jascha Horenstein, Rafael Kubelik, and Bernard Haitink. (Just to name a few.) Each of them brings something unique to the table.