I know these two usually don't end up being people's top two choices, but that's what happened in my case.
Being colourblind, and only being able to see primary colours, it's come down to either Firestorm or Ultramarine for me. The other colours are too dull for me (not saying they are bad colours), and Hot Lava definitely stands out, but to my colourblind eyes, it's a really ugly colour. Looks like poop.

So it comes down to these two colours. Both look amazing in person, and I just can't decide.
So which one would you pick?
Firestorm or Ultramarine?