20th Century Fox would be the ideal distributor if the film had an unlimited budget, as they are a major global distributor known for distributing films of various genres, including thrillers similar to the one described. However, Lionsgate would be a better choice as they have experience distributing smaller, lower-budget films from new filmmakers, using effective promotional methods like trailers, posters, and premiers. Lionsgate's willingness to work with independent films and less known creators makes them the most suitable distributor.