Both of these have grown here for quite a few years. I'm also quite a bit south of you, and SCREAMCICLE was hybridized right here in VA, so it naturally does well. PRIMAL SCREAM has been here since about 2003 and is a huge clump, which has been lifted and divided at least twice that I can remember. I got SCREAMCICLE from the hybridizer, my friend Pat Cochenour, a few years after it was introduced. It is very popular here in my home region 3.
Both plants do well here and both are standouts in their own way.
Primal Scream is one that needs no name tag, the bloom color is unique.
SCREAMCICLE: I am purposely including this contrasted with a purple bloom behind it.
Although oranges are not my favorite colors in the garden, I've learned over the years that gardens need the BRIGHT colors in the landscape to offset the purples, reds and pinks, which tend to recede into the landscape. Brights stand out and when planted near dark colors, give such good contrast. JMHO.
So here's the bottom line that I've observed here in my zone 6/7 garden. These observations may be somewhat related to THIS climate and may not hold true for everyone.
First, BOTH are good plants with decent plant habits and both have distinctive colors.
With your location, you might also look at two other good oranges which were hybridized by Ellen Laprise who lives in MA. Those should be hardy and grow even in very northern climates.
What I've come to observe here is that PRIMAL SCREAM tends to be a little bit top budded and when it blooms, POW ( when you have a clump) it will have a lot of blooms open on a given day, but because of this trait, it blooms out fairly quickly, probably in 3 weeks. But when it's blooming, major visual impact.
This picture of SCREAMCICLE may help give an idea of bud placement and count.
SCREAMCICLE has a better bud count here and is better branched and it seems to bloom with fewer blooms each day but over a longer period of time. This too is a worthwhile garden plant. Some people in my area have gotten rebloom. I haven't gotten rebloom on this but just got an irrigation system installed last year. In this climate, rebloom seems very highly correlated with water and how early the initial bloom takes place!
Hope these comments help. Do look at BOB MARLEY and FLAMING FLAMINGO, also very good.