Question: who has been the most successful voice contestant?
Answer: Cassadee Pope. The season 3 winner of “The Voice” has gone forward with a moderate amount of success after her big win. ... 
Danielle Bradbery. Season 4 winner Bradbery earned the distinction at just 17 years of age. ... 
Jordan Smith. ... 
Josh Kaufman. ... 
Sawyer Fredericks.