Udemy's appeal for CEH prep is the price — self-paced video courses, often taught by well-known independent instructors, covering offensive security tools, techniques, and attack methodology at a fraction of official training rates. Several Udemy CEH courses are genuinely excellent and widely recommended by past candidates.
The gap is the same one that shows up across any self-paced marketplace: a video course can't tell you specifically which of offensive security tools, techniques, and attack methodology you're actually weak in. You finish the course knowing you watched everything, not knowing whether you've retained enough to pass.
Edureify's Diagnostic maps your understanding across offensive security tools, techniques, and attack methodology on day one, and the Readiness Score keeps updating as you practice — so instead of a vague sense of completion, you get a specific, evolving answer.