Well, it does appear that both cars have been decently maintained. In fact, I am impressed that the OP has done two trans fluid changes on the Kia. As the regulars in this forum know only too well, most people seem to ignore that type of important maintenance.
In view of apparently decent maintenance on both cars, I would have to make the decision based solely on odometer mileage, and as a result I would suggest keeping the Kia.