I've read them all and liked them all. They all feel quite different.

Pact is urban fantasy about a protagonist dealt the shittiest hand and dealing with that. It gets pretty dark but I really like the world it creates.

Twig is about kids at an academy in a world where alchemy and biology took off. To the point where grade schoolers creating Frankenstein's Monster would be a class project. It deals with flawed characters in a really unique world.

Ward is the sequel to Worm staring a very traumatized Glory Girl. Imo it's about healing and dealing with trauma and forgiveness. It's the toughest of Wildbow's works in part because he got a LOT of negativity during this that made writing harder. But I liked it for what it was and how it expanded on the Entities lore.

Pale takes place in the world of Pact but in the future with different setting and characters. 3 girls introduced to magic with a strong emphasis on the Others and how they and humans coexist. I think it's his best work so far and would suggest picking up here if something else doesn't strike your fancy. Wildbow has said he likes writing in this world and I think it shows.

I'd also check out: https://www.patreon.com/wildbow/about , it has concise descriptions of each work by the author.