I own both of these - I recently got the electric eel in a swap, but originally I chose JB over it when I was browsing at the counter.
EE is a "bluer" blue, where JB is more greeny-aqua. The textures are worlds apart - JB is a supersoft veluxe, EE by comparison feels almost rough and chalky. When worn, EE is bolder and darker. Both blend pretty well. You may want to get both, depending on your budget and how close you like your shadows to resemble one another. They are close. If I had to sum up the difference in one, it would be that JB can work as a subtle wash for day, whereas EE would only really work as a punchy bright look.