Any edition with the car number CS 8163 can be bought in confidence, this is the original Columbia master which has been in press without interruption for >60 years.
This edition has always been considered an example of how a ‘cheap’ vinyl edition of a record would sound better than digital remasters.
You can decide later to get a more expensive version, I like the Classic Records 200g single LP but it sells for a high price.
One word of caution with the MOFI 2xLp 45 rpm. It is based on the ‘corrected’ speed master released in the 1990s.
It was discovered by some specialists that the tape used for mastering side 1 was at the wrong speed (at the time, record companies used two tape recorders to be on the safe side, and one of the tape recorders was set at the wrong speed by mistake, recording slower by 3% or 5%, I forget - in other words the version of Side 1 we all know is 3% too fast).
I could never figure out how tMiles Davis and the entire band, the producers, etc, could possibly have missed this, unless they deliberately decided to have a faster version.
Anyway: The bottomline is that the version of ‘So What’ is much slower than before, and that may be surprising at first.
One pressing by Classic Records has both versions of Side 1, slow and ‘normal’.
I have several SACD editions, and a high-res,PCM master, none of them sounds better than the ‘cheap’ original Columbia CS 8163, especially if you pick a Mint 180g press.
That’s my 02, hope this helps.