Genetically modified vines

To continue on the subject of the environment: Genetically modified grape vines are not allowed for production within the EU, but some experimental plantings exist. There are for example some 70 vines planted in the Alsace. One can think that from an environmental perspective it is bad with genetically modified grapes, but the issue is not simple. One of the main reasons to work on GM vines is to develop plants that are more resistant to diseases (in the Alsace planting they hope to avoid “court-noué”). If this is successful it would mean that spraying in the vineyards with chemical substances could be dramatically reduced, which would be a good thing. So, what should one prefer?