I think ‘must-have’ and ‘favourite’ are more or less interchangeable in this case. Must-haves to YOU. Listings of just classic, important scores would be far more boring.
Of course, the cutoff point at 1948 means that I can’t choose my favourite score by some of these. My favourite Waxman score is PEYTON PLACE, for example, but that came out in 1957 and hence too “new”.