First..... D@mn what a car.
Second...... I think the 991.1 will take the hit. The 4.0L motor is a significant design upgrade that should depreciate the first series cars.
The 991.2 owner will be able to chose. The question could be worded which version will sell the greater number of cars.....
Here is the PDK....
https://www.pca.org/news/2017-04-28/video-watch-new-911-gt3-tear-it-track