For his career Sanchez has pitched better with 5 days of rest over 4 days.
Stroman has pitched worse. Even though he struck out slightly more batters, his walk rate was almost 1.5 times higher.
These are small sample sizes though.
Sanchez = 16 starts on 4 days, 9 starts on 5 days
Stroman = 21 starts on 4 days, 14 starts on 5 days