I've ran my first supercharged car in 1964, i've also been tuning stacks since about the same time. I really don't know how much HP change there is between stacks and a hat or between stacks and a toilet bowl, i think they all can run good. I have a 4.100 toilet on my 377" Malibu, i have a friend that has a 4.100 bowl on his 55 shoebox weighing 2650 lbs with a 396" sm/blk that runs low 5.60's. When i first built my 377" motor we put it in my friends dragster with stacks on it. It ran 5.15 & 8.23 @ 158mph at Memphis. The best i can run in my Malibu weighing 3250lbs is 6.52 and 10.59 @ memphis. So i guess all to a persons liking, but stacks are no harder to run/tune than a toilet bowl or a hat, and also can be dead on. Ref. Jimmy Smith here on RJ, runs a 350" flattop motor with stacks, he runs the 7.00 class with a long petal stop screw, and the 6.50 class wide open in a 3,000lb Camero, and shoots 4.0's lights all nite long.
JMO
Zip.