Charles Munch recorded this twice - once in 1955 for a mono RCA Red Seal LP (with artwork by Andy Warhol) and then again in stereo in 1962 for RCA Living Stereo.
Apparently, the CD version that is currently available is an early stereo recording from the 1955 session, which had never been on LP (and maybe not even reel tape). Googling this topic, it seems that many people prefer the 1962 recording, both from a sonic and performance standpoint.
Does anyone have any detail on this? Is this summary accurate, and if so, does anyone know the background on the choice of the earlier session?