Hi, i own a grande 2017 pre fl and have used Yaris 1.5 for quite a bit as well, there is little between the Yaris and the grande other than the price bracket since both belong to different segments, both have good fuel average, the grande has much better cabin space and seating comfort, the grande also has more power, however the Yaris also offers decent features and will be relatively newer, so less chances of something going wrong in the short term. really just depends on your requirements.