Quick background, I commissioned an artist but wasn't too happy with the result (no, the title wasn't a placeholder), and especially the communication.

So I gave myself 1 week to see what I could before commissioning another one.

Which one do you prefer ?

The one with the black background is mine. Any feedback is welcomed, and you can say it's crap if you want :D

So still messing around with it. 

From this



To this

Bumped it to this 

My favorite among the 3 last ones is your 2nd iteration.

Definitely yours.

The commissioned art looks like a clever but unfinished draft.

FWIW, I prefer the smoother fireball. It has a more graphical look, akin to a logo, and is more readable. This pushes it into the forefront more for me. A little bit of flourish might be fine, but I think less is more here, especially at capsule size.
I also don't prefer that the second revision breaks out of the frame like that. I think it's best to pull that shape wholly in the frame.  Overall this feels like it's moving in the right direction. I like the colors and it's eye catching.