for starters mufe has really crappy packaging and mac has a better packaging.so this point goes in favour of mac
secondly, mac has more quantity so is cheaper, another point in favour of mac.
thirdly, the shade numbering system of mufe is crazy! i have no idea wats the logic behind numbering the shades. so it may be easier to find a shade match with mac.thats another point in its favour
fourthly,coverage: eventhough both of them are sheer mac f&b is like u have nothing on.i see it as between no to light coveage. mufe has light coverage. but for both coverage is buildable so thats a huge plus for me where mufe is concerned.
fifthly,finish: i find mac to be more dewy as compared to mufe. so for me thats a point in favour of mufe
bottomline: despite crappy packaging and insane shade numbering i stick to mufe for its light coverage and finish. besides, mac has been known to break out some people (not me so far but y take chances?) and oxidise.so mufe is a safer option.
i hope that helps!