Guards! Guards! is excellent. I'd vote for Wyrd Sisters too.
Incidentally, I think the Wyrd Sisters cartoon is the most successful Discworld adaptation (https://en.m.wikipedia.org/wiki/Wyrd_Sisters_(TV_series)). I must admit, I've not tried the recent series based (very loosely it seems) on Guards! Guards! I don't what to be That Fan who says they got everything wrong but...
Tried watching the recent series ("The watch"). Not Pratchett.
I hesitate to use the word "unwatchable", but this series comes close. It is both an awful adaptation of the Discworld universe—and awful even otherwise.
Incidentally, I think the Wyrd Sisters cartoon is the most successful Discworld adaptation (https://en.m.wikipedia.org/wiki/Wyrd_Sisters_(TV_series)). I must admit, I've not tried the recent series based (very loosely it seems) on Guards! Guards! I don't what to be That Fan who says they got everything wrong but...