I'm not sure - they have different road-testers, CarAdvice never used those 2 ladies who CarSales used - in fact I've never seen them before or since. One never knows who owns what these days.
Consumer Reports got 52 mpg overall with both the Prius and Ioniq. Their biggest complaint about the Prius? The seats have mediocre support. However, the Ioniq had three significant complaints: transmission isn't the smoothest (including delay off the line), handling lacks agility, and stopping distances are unusually long.