So it’s time to forget it. Up to now it’s just communication. Nobody has really seen it and tested it. There are other models which could be added to Windy before the « virtual » IBM GRAF model.
ECMWF is not a model, this is an institute making a model called IFS so comparaison is between IFS and ICON. @Korina is right that you should try and develop your own expertise with both models to understand when one model can be better than the other.
Some tests and statistics trend to tell that IFS, in average, would be better than ICON but those tests and analyses are done for only a few parameters so what is the exact meaning for yourself and the data you want to use,...