Kia and Hyundai share the same engineering team in South Korea so their reliablity is abou the same. It ranges from average to above average on all their cars. They are solid cars that last a long time.
I would test drive the cars you are considering as they are both pretty safe bets in regards to reliablity, decent fuel economy, and if that is what you need in cargo capacity it will work. I only know about the Santa Fe in the snow and the AWD version is capable. Not the best AWD system but good enough for the snow.
Best of luck in your hunt for the car you want.