Hmm. I think Brook is more technically sound but I think Spence is far more explosive. Also, and I can't find the word to describe it, but Spence has a scary quality to him. It's almost as if he becomes a sociopathic punishing machine with no conscience and will only be stopped when the ref stops it. Very scary. Like Crawford, he has a real mean streak, but his is more understated than Crawford's. It's like once a button is pressed he becomes a monster. Poor Algieri found that out.