The two shared a lot of screen time together in the early seasons, and the age gap between them isn’t that far so they probably had a fun time hanging out between scenes while fans only saw Joffrey making Sansa’s life a living hell on the show.
The choice sounds odd, but, then again, fans of Game of Thrones have a different perspective of Jack Gleeson than Turner likely does.
In a world where Hodor, Ned Stark, Robb, and Catelyn could still be around, Joffrey Baratheon is the top pick of Sophie Turner?