I dont think there is a second opinion within the aeronautics community, Gripen is a better aerodynamic design, there is a series of videos by millenium 7 regarding the topic, have a look. However, this does not mean Gripen is a better fighter since that includes other factors like weapons, sensors, logistics, economics of production, politics etc.Gripen is a better designed aircraft in comparison to the Thunder due to the greater experience Saab has in aerospace design
THAT IS NOT HOW DESIGN WORKS...LOOOOOOL