What are the best NuWho novelizations that are must-read? Or just your favourite ones?

I recently started rewatchign the show again for the second time in my life. I'm watching series 12 but as I've never watched The Flux before, I'm excited to get into it, as into RDT2 era (which I havent seen yet either except for 60th anniversary specials).

But I've noticed a lot of people talking about novelizations of the episodes and saying that they have a lot of extra stuff in it not seen int he episodes and it got me thinking: What are the 'must-read' or simply your favourite novelizations you want more people to read? I already purchased "The Day of the Doctor" book - what else do you recommend?

I haven't watched any of the Classics yet (but I plan to later this year), or heard any Big Finish audios yet (also planning to do it soon) and I want to watch The 1996 movie soon as well, but any novelizations featuring the 8th doctor are also welcome. Any Doctor stories featuring 8-15 that are your favourites!

EDIT: I just rememebred Alex Kingtone wrote The Ruby Curse - is it good? And if you have any rec of books abotu comanions I'd love to read them too!