Definitely the original, personally. The only thing about the Donmar recording that I really love is that part in the finale when the whole ensemble sings a capella.
I love Bertie as Leo, but I prefer the overall sound on the OBC
My father (AIDS)
My sister (AIDS)
My uncle and my cousin and her best friend (AIDS, AIDS, AIDS)
The gays and the straights
And the white and the spades
The performances, sound, orchestrations and yes, even the material are all superior on the OBC. What a shame that version is no longer available to license.