I have like 20+ different CDs on this noble piece. Not to be overly verbose:
Yannick Nezet Seguin’s Orchestre Métropolitain recording is my fav (SACD):
https://www.amazon.com/Saint-Saens-Symphony-No-3/dp/B000F7MJDE/ref=cm_cr_arp_d_product_top?ie=UTF8
Sergiu Comissiona and Houston Symphony is outstanding IMHO too (DVD audio, unfortunately):
https://www.amazon.com/Saint-Saens-Symphony-No-Organ-Franck/dp/B0001LYGIK
Avoid:
Eschenbach / Philadelphia (inferior sound; the conductor ruined this piece; I am an season subscriber in Philly, the organ doesn't sound like what's on the recording)
Yannick Nezet Seguin’s Orchestre Métropolitain recording is my fav (SACD):
https://www.amazon.com/Saint-Saens-Symphony-No-3/dp/B000F7MJDE/ref=cm_cr_arp_d_product_top?ie=UTF8
Sergiu Comissiona and Houston Symphony is outstanding IMHO too (DVD audio, unfortunately):
https://www.amazon.com/Saint-Saens-Symphony-No-Organ-Franck/dp/B0001LYGIK
Avoid:
Eschenbach / Philadelphia (inferior sound; the conductor ruined this piece; I am an season subscriber in Philly, the organ doesn't sound like what's on the recording)