Well, they are both series, but the Discworld books have a bunch of recurring characters, and are basically comedic, whereas the Culture books do not, though S

Well, they are both series, but the Discworld books have a bunch of recurring characters, and are basically comedic, whereas the Culture books do not, though Special Circumstances agent Diziet Sma pops up a few times. And the Culture books are much darker - the Culture is very morally ambiguous. Discworld is a very funny place - I'm sure you would enjoy it.