It's so situation dependant (music style, venue type, taper's perference, stealth or open, etc) that it's not suprising the answer will be wildly different for each of us. I currently own a pair of nice German SD cardioids (Gefell M94/MV692), well regarded multipattern LDs (ADK TL), a nice stereo LD mic (Peluso P-stereo), an ambisonic mic (Tetramic), various miniature omnis (B3, 4060, 4061, panny cap based binaurals, old Shure lavs), and some other oddballs, but if I was only allowed to use one mic model from this point forward, it would be the DPA 4060. I do require at least 4 of them though, not just a single pair.. and I ain't budging from that stance.