This was incredibly helpful, I really appreciate you clearing things up - I was leaning toward B1 with the IEMs I have just ordered off Jack but now that you say that I'm pretty sure I'll rather the G1; I do no critical listening whatsoever and I listen for extended periods of time as I work long hours, my hearing is a little sensitive. I also listen to a lot of rap and bass heavy metal/rock (Primus because Les Claypool is a god, Korn, etc.) and some EDM as well so I guess that'll fit my preferences the best. I also listen to a lot of female (and male) vocalist jazzy type stuff like Lera Lynn, Diana Krall, Sarah Blasko, Tom Waits, Leonand Cohen and the likes so hopefully the lesser mid emphasis doesn't hit me too hard!
Would you say my assessment is correct and I'll be making the correct choice? Jack kindly offered to try both modules out with my IEMs and report back prior to me making a final decision.