I´ve got these:
CD Chopin:"24 Preludes" op.28 (1831-38)/Karolyi/ark 53-91 mono 2cdgi 909
CD Chopin:"24 Preludes" op.28 (1831-38)/Cortot/piano library 42-95 pl 206-8
cd Chopin:"24 Preludes" op.28 (1831-38)/Kissin/rca
LP Chopin:"24 Preludes" op.28 (1831-38)/Cortot/mel 3x-83 m10 44865 003
LP Chopin:"24 Preludes" op.28 (1831-38)/Kerer/emi cfp 40284
LP Chopin:"24 Preludes" op.28 (1831-38)/Argerich/dg 415 836-1
LP Chopin:"24 Preludes" op.28 (1831-38)/Moravec/conn soc 2lp st 66 uden nr.
LP Chopin:"24 Preludes" op.28 (1831-38)/Magaloff/ph 16lp 6768 067
LP Chopin:"24 Preludes" op.28 (1831-38)/Arrau/ph 80 6768 233
LP Chopin:"24 Preludes" op.28 (1831-38)/J.M.Darré/vanguard vsd 71151
LP Chopin:"24 Preludes" op.28 (1831-38)/Pollini/dg 75 2530 550
LP Chopin:"24 Preludes" op.28 (1831-38)/Pollini/joker live 60-83 sm1334
I can´t say that I know them all very well, but overall I´d say (and many seem to agree) that the Argerich is really spectacular and provides a lot of creative, fiery imagination. However I don´t think it should be chosen as the only one to have, since her tempi are practically always quite fast, sometimes lacking a bit of "meditation" as regards the music.
I gave the Cortot a listen just the other day, but in spite of being a huge fan of early piano recordings (especially Rubinstein of the 30s, Rosenthal, Horowitz, Friedman and others) I found it disappointing. There was (sorry to say this) much too many errors in the playing and the notes, and the phrasing was even comical now and then to my ears. I might have had a bad day for it and some will definitely disagree about this valuation, though.
Magaloff is generally uninteresting in Chopin, swift tempi but not much to say, I only have it because it is a complete Chopin LP-box.
Pollini has some reputation, these are his first two recordings, the Joker LP being live, the DG his early issue. It turns out that there is a more recent Pollini digital DG recording and I´ve heard a few excerpts from it that were better and more expressive than those two.
Rudolf Kerer has made a few remarkable records, especially the Schumann Symphonic Etudes. I happened to hear the Chopin preludes yesterday. Tempi are middle-of-road or slow, sometimes slower than usual, but expressivity and drama was often lacking too much to my taste.
Moravec´s is part of an old 5LP-set from 1966, often with some controversial tempi; he seems pensive and original in his approach, though rarely very outgoing or dramatic, but definetely one of the more interesting issues and Chopin pianists. I don´t know if there is an even later issue by him of the Preludes, perhaps.
Karolyi´s is good, expressive but not that original, somewhat difficult to obtain and not the best sound.
As regards Arrau and Kissin, I don´t remember much right now. Arrau has his typical, somewhat subdued, broad and slow style in Chopin, his Nocturnes being perhaps his most original controbution to the Chopin discography. Kissin is often very good in such repertoire.
As far as Darré is concerned, I don´t recall it, but have a vague idea that it´s very good.