If I am interpreting the OP question correctly, I think this thread went off the deep end in bad way. I believe the intent was to ask what were people's preference in non-lead bullets was (not whether or not lead should be banned, or which godless, baby-eating cabal is orchestrating an overly elaborate plan to inconvenience shooters by telling us that lead might not be the healthiest thing for us or other critters to eat).
To that end, When I shoot mono's, I am solidly in the Barnes TTSX or LRX camp only because Barnes are by far the most ubiquitous non-lead bullet available. In fact, Barnes are the only mono's I have ever used but I am tempted to try the CX and Naturalis options. It would be great to hear of some real world use and critiques of the less popular monos.