The London studio album was totally redundant, duplicating the same program as the Lincoln Center recording with an inferior cast.
I would rather they had done one of the early Merman scores that predated the cast album era. ANYTHING GOES would have been a prime choice since at that time the only available recording was of the heavily revised 1962 off-Broadway revival. Maybe even DUBARRY WAS A LADY or RED HOT AND BLUE? How about an album of GIRL CRAZY with Merman and Ginger Rogers recreating their original roles? But no, we needed a 6th album of AGYG in the catalog (joining the OBC on Decca, Film ST on M-G-M, the TV cat on Capitol, the Doris Day/Robert Goulet studio cast on Columbia and RCA Victor's Lincoln Center cast album.)
I still find the Lincoln Center disc as definitive as we're likely to get.
Cast albums are NOT "soundtracks."
Live theatre does not use a "soundtrack." If it did, it wouldn't be live theatre!
I host a weekly one-hour radio program featuring cast album selections as well as songs by cabaret, jazz and theatre artists. The program, FRONT ROW CENTRE is heard Sundays 9 to 10 am and also Saturdays from 8 to 9 am (eastern times) on www.proudfm.com