Carrion
Arcane
As a whole, Act II is by far the best part of TW2, mostly because it's a bit more open than the other chapters but also because I feel it has the strongest cast of characters overall. It does have its issues, like the huge infodump at the beginning and some parts that are rather poorly explained or executed, but all in all I certainly prefer it to Flotsam. Gameplay-wise there's of course not a huge difference, the game is what it is.
Also, the best parts on Roche's path are only near the end of the game.
Also, the best parts on Roche's path are only near the end of the game.