Killing Fields requires pheno hunting in a major way. I'd get 3 packs and go to town if you go that route. Yield and stretch on these is outstanding. There are outstanding phenotypes to be found as well. If KGP is putting you in his top 5 all time you're a winner. But not all are like this. There are not so good plants in the line - mostly with respect to smoke quality - not so much other factors like yield which they all seemed to do well for me (5 phenotypes). I found one I'd call a keeper in those 5 plants but it's not as good smoke as my best SP keepers. It's comparable to the SF... the lesser SF phenotypes. However I know there are better ones in there. It yielded huge though and was real easy to grow. And a lot of people love her so she's still around.
Sugar Punch requires some pheno hunting but my guess is you'll find a good plant in 1 pack that you want to keep. That said there's some indica influence there. And a lot of variability in the plants in a lot of ways. IN particular in how they grow. Not all of them stretch a lot, which it sounds like you want. Some do stretch a decent amount. I'd say it's 50/50 in that regard.
Out of the 6 I ran I found 3 keepers. One I did not keep due to the clone dying when I got sick. It was the best one, but it did not stretch too much. The other two stretched a lot. One was golf ball buds the other more like colas. Golf ball finished in around 7 weeks, SSH Cola pheno closer to 12. So there's a lot of variability.
If you're willing to hunt you'll find a good plant.
Silverfields every plant was very good for me but my best Sugar Punch plant was superior. They tend to stretch more regularly.
Currently growing Zamaldelica. Only a bit over 6 weeks in so I can't tell you how they're going to be, but I can tell you there are a decent % of true hermaphrodites in the line and they will take a while to finish. I don't expect to harvest any of them before 12 weeks although it's possible. One I expect will end up like a 16 weeker... but who knows.
I also have a Sannies Jack in flower right now and another about to be put into flower.
Sweet Skunk has some killer phenotypes (from PeakseedsBC) that are all in the head.
There are a lot of options out there.
That one Sugar Punch plant I lost was definitely one of those plants I'd love to have again. Which is why I bought 6 more packs of Sugar Punch. But I also feel like I owed to other lines to see what they had to offer. Despite being great smoke, it wasn't as ceiling free and tolerance free as I'd like. It was a step down from the Bright Green happy weed of my youth in that respect. Which I suspect was a Skunk x Haze for the record or a pure Haze.
All of these Haze polyhybrids require some level of selection. Just FYI. SSH from MNS - you will need to run a pack likely to find a winner. He will tell you as much. But a winner will be outstanding. And so on and so forth.
Currently eyeballing my NYC Haze x Jack from Chimera. These might be it for me. The reports on it are pretty unreal. Hempdepot has packs right now, if you want a pack I'd be couriering that cash ASAP because they sold out in 10 minutes on SeedBoutique. I think less than that even.