Can’t help you but interested in what others have to say. I just popped Cherry G and Skunk Hero x Afghan Kush for my outdoor grow this year. With Grandpa’s Stash being a new drop last fall, you won’t get much feedback on outdoor grows. That being said, Colin states that the GS strain was created specifically for outdoors. Check Thumper60s post in the Outdoor Forum…he’s growing GS this summer so you can compare notes. I’ll be posting regular updates there as well.
Good luck with your decision/grow. All solid choices, IMO.