


Every Witcher game does something exceptionally well which makes it stand out and feel unique
Witcher 1 puts heavy emphasis on the witcher profession and the hunts feel a lot more unique and fun as Geralt is basically a noob due to having lost his memory and he's learning alongside you. I also think the game nails the darker, more cynical side of the Witcher world and it feels like the whole game is just Velen at some points.
Witcher 2 has the most morally ambiguous storytelling, as it's mostly focused on the politics of the Northern Realms and chocies are a lot more important than in the other games to the point where the whole second chapter can be completely different, which warrants a second playthrough.
Finally, Witcher 3 nails the more emotional storytelling as the game is very cinematic and focuses a lot more on Geralt and his family. I would go as far as to say that this is the first game where Geralt truly feels like the main character. It's also an actual open world game and has the most content, not to mention the DLCs.