The 1990s film with Anthony Hopkins and Debra Winger is rightly showered with praise, and I enjoyed it very much, but this TV original is just as good, and in some ways, more appropriately cast. Claire Bloom isn't a brash Joy, but she is still confident and throwing her cap at her favourite author (played by Joss Ackland in one of his best performances).
Quieter, calmer, and less emotional than the Attenborough film this may be, but it does justice to what is a marvellous play full of meaningful dialogue. You'll still cry to this version, but perhaps you won't have the musical prompts to set you off.
There's room for both - and having seen this on stage, I would say that the Ackland/Bloom one is slightly more faithful. But they're both excellent.