Both seem like each respective countries top 147 prospect, both should be fighting for belts soon. Special K seems to be the more well rounded boxer, whie 1 Time has that big time KO power.
After watching some film on both fighters I would pick Brook to win. Thurman is a heavy puncher but he telegraphs his punches. Brook seemed to have much faster hands, moved better on his feet, and was smoother and more accurate with his punches. Brook seems to have more skill and is a better boxer. Brook has good power too. Brook seemed to have a better variety of punches and quick combinations. I think Brook will beat Alexander too.
thurman by ko, brook probably has a glass jaw
when he gassed against Jones he showed reasonable chin tbf. Though he (jones) definitely doesnt hit as hard as Thurman
I have never seen Thurman fight. I'll watch some film on him and get back to you. I think maybe Thurman would win by KO going off the records of both men.