Because of the different beam characteristics, The high and low levels between the 2 lights are hard for me to gage. Using my eyes and bouncing the light off a surface at close range to try to even the beam sizes, I would say the High and low appear pretty close. The Extra low on the BitZ is noticeably less bright and would be preferable to me for the low level in the main menu.
The E1B's beam is a narrow "cone of light" with little spill so it definitely out throws the BitZ but in my opinion, the Bitz does throw well for such a floody beam. The Bitz has the beam with the most even flood of any of my other lights (except my Zebralight) and is much easier on the eyes. The BitZ is much easier to use while working on something because the beam is spread out and less light is bounced back into your eyes. The E1B is more focused and can be hard on the eyes when working close up.
The Bitz beam is whiter than the E1B and by comparison the E1B looks almost purple.