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Natural Gas is basically methane, while LPG is a mix of Propane and Buthane. Also, LPG is stored at a lower pressure (15 bar for LPG vs. 200 to 240 for CNG) and the LPG setups have fewer safety valves than a CNG setup. CNG itself is also safer due to its higher ignition point compared to LPG.
I have some experience with ethanol because I'm Brazilian, and actually it seems kinda predictable to me that it wouldn't catch up in Europe due to the feedstocks available there. Regarding biodiesel, it's such a shame that it's getting somehow neglected, in part due to problems in vehicles fitted with DPF.
Anyway, if I were looking for a brand-new car in Spain I wouldn't disconsider an LPG-capable one.
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