Looking for comparisons of these two speakers in a closed-back 1x12 cab in terms of tone, breakup, etc. with a Marshall or Marshallesque ~20 watt head. How do they compare? Also, the G12M is a rather inefficient 96db, which I like, but the Blue is a full 100db. Is the Blue considerably louder as well? More headroom (not good for me)? Did a search but these two in particular were never directly compared.