Can you clarify what you mean by “Black Hole”? If you’re talking the accretion disk, it’s more of a pancake shape, if you mean the event horizon, then yes, roughly spherical, if you’re talking about the singularity at the centre, then trying to describe it using math and geometry is just going to make your head hurt because your brain isn’t designed to process reality that alien to your experience that laughs in the face of the limitations of human comprehension.

I think they are spherical, but there is stuff surrounding it, and also the gravity bends the light around it. That’s what give them the weird appearance.

Just a guess. I dunno anything.