I voted Rozier simply because he has a more well rounded talent set.
There is really noting that Smart can do that Rozier can't do. Smart's greatest talents are his defense, rebounding and then passing. Rozier can defend, he can rebound, and he can pass.
However Rozier has excellent handles, has elite athleticism, and is an excellent shooter - and Smart is poor in all three of those criteria.
Rozier can pretty much do everything on the court, he just needs time to improve/develop those areas. Smart has significant holes in his game that I'm not sure he'll ever develop.
Sometimes I think because Smart is such a good and willing defender he gets put in tougher situations. If I had to guard Beal like he does I might not have much energy for offense either
Rozier has been doing an incredibly good job defensively on Wall throughout this series also, so that shouldn't be ignored.