Rachmaninoff, Symphony No. 3 in A minor, Opus 44?

Andre Previn's two performances with the London Symphony Orchestra are excellent, well recorded and have held up extremely well over the years. Previn's earlier recording for RCA (LSC 2990) has never been released on CD, as far as I know. It is more dynamic and intense than the somewhat later (mid-70s) recording for EMI, which is still excellent.
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If you like an enveloping presentation then Telarc's version with Horatio Gutierrez is nice (especially for the sweeping orchestral stuff - although some complain it is too loud and piano deatil is lost because it is not close-miked)

Ashkenazy's recordings of all of the symphonies as well as the Symphonic Dances, Isle of the Dead, and The Bells, are outstanding. For both performance and the recording.

I haven't checked but I think they are available as a budget set now. His work, and Previn's, are IMHO, probably the best and I think the Ashkenazy and the LSO are better recordings and I like the performance much more. Until I got them I enjoyed Previn's, especially his #2.

Sonically the differences, to my ears, are basically that the Previn versions are a bit more lyrical (languid) and the Ashkenazy are more crisp and clear. To me its not a small difference. I like the pace, tension, color, whatever, that Askenazy brings to these already very lyrical symphonies. Unfortunately, from my POV, most performances really slow down the pace and what is initially very beautiful becomes boring on repeated hearings. FWIW, if you haven't already heard them and decided, I wouldn't be without Ashkenazy's Symphonic Dances! I indorse the set because you also get to hear his 1st Symphony which isn't too bad, and not much like #2 & 3.

Enjoy.