In international markets where both Kia Sportage and Toyota C-HR are sold simultaneously, they do not directly compete with one another. The Sportage is not just roomier on the inside, its exterior dimensions are also larger. So accordingly, its direct competition is with the likes of Toyota Rav4 and Honda C-rv respectively.
The Honda vezel/Hrv and Kia Niro are more appropriate comparisons with the Toyota C-hr. Considering they have comparable dimensions and prices when brand-new.
However, it's a completely different ballgame when considering a brand new Sportage with full dealership support with a used unknown history vehicle with zero local support. The Sportage is clearly a better choice.