DHam is a great player who is working his way through is freshman year. He has a great natural shooting stroke, excellent ball control, and rebounds energetically. He averages 7 boards, 3 assists, and 1 steal per game. He has a good nose for the ball and a good head for the game.
Purvis is a problematic player in his 3rd year who hasn't improved since he arrived at college. He has an awkward shooting stroke, a weak handle, and rebounds lethargically. He averages 2 boards, 1 assist, and less than 1 steal per game. He has no nose for the ball and horrible BBall IQ.
DHam is an NBA prospect who will do wonderful things at UConn before he leaves, and he'll be well respected and liked by all at that point.
Purvis will make you want to throw him through windows regularly, as he keeps both teams in the game simultaneously, and will eventually supplant Dyson as the most polarizing player in the JC/Ollie era. He has zero chance of making the NBA.