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Either 1/12 or 1/6 would be ideal.
1/6 would be great for the detail, but crazy dynamic poses are a lot tougher at that scale whereas a 6" fig with a stand could do way more exciting stuff without fear of taking a $200+ dive.
Also I figure the face will be wierd, something about Geralt is special, not even CDPR can keep him the same throughout the games and promotional materials.