Well you havn't got any replys so ill try to help . i havnt heard the micro or mzero, but i prefer the axioms when i compared the atom/titan to m2i/m22ti. this isnt the same comparison you're after, but in general i like the detail in axiom tweeters. i have heard the michaura m55 speaker which used axiom 3/4 inch hyrbid tweeter like the mzero i think, and i prefered it to the atom as well. problem with the mzero may be the output. i bet the atom will have more clean output than the smaller mzero.