Chapter 4: Paths/Levels/Cultivation Tiers
My favorite so far, but pending more content: Lord of Mysteries
The rest of this is pretty spoiler if not caught up with current chapters (of MTL).
The author makes a promise that it's his most flushed out world so far.
The seer and clown path seems interesting. Spectator and the bard path beginning are very interesting too. Later we find out there are 26* Cards of Blasphemy with full paths.
Outside of how this ends up delving into a One Piece type search for the cards of blasphemy, I'm very interested to see the 26 unique paths to becoming a god. Especially how you can mix and match potions later on in series.
CREATORS' THOUGHTS 
Tim_
Tim_ As I'm making this list after two years after reading, I might be biased towards stuff I read recently, so if I forgot a novel you feel has a really cool path progression, please leave a comment.