Probably a highly contested topic between fans...
I wasn't for years, laugh if you want but Christian upbringing kept me away until the early 90's, and I have been a fan since.
Over the years I learned a lot about them, learned to play guitar and really appreciated the simplicity,
So I love "Are You Ready?", "Rock and Roll Ain't Noise Pollution", "For Those About to Rock", "It's a Long Way to the Top", and some others... but I keep going back to one of the first songs I heard as a teenager from a dubbed tape (music piracy was invented by the dual cassette player).
From "Dirty Deeds Done Dirt Cheap" but I first heard it on the "Who Made Who" soundtrack: "Ride On" has got to be the best IHMO. Bon Scott on vocals, just a smooth jam if you could ever put those words together with AC/DC.
Yeah Angus is great, but I'll put Malcom against any rhythm player in the world, the most solid, in-time, powerful rhythm player I have heard.