Like many Pratchett fans I have not read the last published Discworld book, The Shepherd's Crown, because then I will have read them all.
The author of this piece hasn't read the Witches books! I'm jealous, they still have so much great Pratchett to get through.
I sortof feel that the Witches might be the best, but then I think about the Watch, and I'm conflicted.
You can't beat (literally) Esme Weatherwax and Gytha Ogg. Magrat is great too, particularly in "Lords & Ladies".
I didn't read the Tiffany Aching books for quite a while because I thought they were aimed at adolescents. Perhaps they are, but they are also full of Pratchett humour and characters. Don't miss out on them!
I recently ready through the Tiffany Aching set and adored her.
I read it, and I cried like a baby. Still do whenever I reach for it.