"In general, unless there are some significant differences, STEREO would be preferred."

Considering that stereo was NOT the primary mix at the time, it is interesting to hear what the preferred mono mix sounded like. Mono mix was where the artist were concentrating since most of the airplay came off of transistor radios and monophonic record players that were prevelant at the time.

Frankly, it is only of interest to those real hardcore collectors who simply want to have everything.