Night Watch.

Night Watch or Going Postal. I can’t tell which one is better. It’s been a while since i read them.

Withes abroad

Guards! Guards! Hard to decide though because I also love so many other Discworld novels.

For me it’s difficult to remember, too.

I loved his very first Discworld book “The colors of magic”. I also remember a book containing a siege (Was it “Guards! Guards!” ?) But the afirstmentioned one was better for my taste.