There are 1000s of peppers out there all with different flavors. so I would suggest you experiment.
Thus the fun, the journey.
Great question, OP.
Interesting commentary on the Ajis. (I'm waiting . . . and waiting. Ajis may be especially good for developing patience.)
"Soapy" is a criticism of cilantro (which I like with food) by those who don't like it, so we'll see about the Ajis.
Subjective tastes and heat-tolerances also emerge in this thread. I've had jalapeños that could induce tears and others that might as well have been bell peppers . . . and that can happen with side-by-side plants from the same seed!
Serranos may be considered utility chiles, but I like 'em quite a bit, and, roughly, that's about as hot as I can eat raw. Well, wait, I ate a red tepín from the plant yesterday, but it was small, of course.
Black Hungarians are new to me and have been useful with, I'd say, a sub-average jalapeño heat.
Black pearls are fun and beautiful with a reasonable heat level, but the Texas heat is killing the plant. I actually just dug it up yesterday, transplanted to a container, and set the thing in the shade; it already looks happier.
On the first black pearl I tasted (raw), the heat deployed in three distinct stages. It was interesting, complex, and long-finished.
I've been chasing the dragon ever since and have never quite recaptured that experience.
Fataliis are in the ground but dropping their blooms in the 100°F heat.
The quest for flavourful fire goes on.