Exum didnt play much this year and that is a knock on him. Although having two injuries is not really a big issue. He just happened to have an ACL tear that is common and a freak accident. But lets compare their stats last year.
https://www.basketball-reference.co...mart&y2=2018&player_id2=smartma01&idx=players
Per 100 Exum has better points, assists, FG% and Offensive rating. His defensive rating is slightly worse than Smarts but not by much and Exums net rating is +4 and Smarts is -7. If you go by NBA.com net rating stats Exum blows Smart out of the water and I think those are more accurate numbers.
Exum has a better TS%, FG%, Ast%, off WS and WS/48. He also has a lower TOV%. Plus Exum has better physcial tools, he is taller, faster, and has better length.
https://stats.nba.com/vs/advanced/#!?PlayerID=203957&VsPlayerID=203935
https://stats.nba.com/vs/#!?PlayerID=203957&VsPlayerID=203935&Season=2017-18&SeasonType=Regular Season&PerMode=Per100Possessions
Yes there are some stats last year that favor Smart but there are far more than favor Exum. Plus Exum is a year younger and a late developing player. Combined with the fact Exum has not had the chance to play as much.
Exum will have a much better season next year than Smart.
I would be shocked if many people who watched both players chose Smart. Unless they are one of our resident Exum haters.