Colour of magic/Light Fantastic is also different in structure to the rest of the series so, apart from the footnotes, isn't as representative imo.
I love Pratchett all of them, even the less developed. There's the discworld series but his children's books are also a good read. I still have a fondness for The carpet people and The Bromeliad, not DW but fantasy. I think everyone should read The Amazing Maurice and his Educated Rodents too (this is Discworld but more standalone).
I would save Jingo, Pyramids and Moving pictures until you have got into the series personally.
I do like Rincewind, sad he's not getting the love! The last continent, Lords and Ladies, Carpe Jugulum, Witches abroad, Men at Arms, Snuff, The Truth, Reaper man, Mort, Interesting Times, A hat full of sky and making money are my favourites from each group.
Although I realise that's nearly all of them and there's very little in it.
I love Thief of Time and prefer Susan in this but have seen it doesn't always get the love The Hogfather does.
And I hated the Sky shows, even though it has a lot of my favourite actors in it and even though Sir P was in it and advised I thought the style missed the mark. So personally don't feel that you could judge one way or the other from the tv if you would like the books.