I'm skeptical of most bioenergy projects that involve growing things in a field. The best by far I've seen is seen is Brazilian sugarcane to ethanol. Sugarcane is around 8% efficient at converting light into biomass, for comparison corn which the US uses for ethanol is 1-2%. Of course you then have to process those into something else to allow us humans to make use of that energy, so real efficiency is lower.

Compare that to PV solar which is around 18% in a form that humans can use. Of course electricity is more difficult to store than ethanol and hydrogen but there's a big efficiency advantage that has to be made up.

Much better would be to use organic waste. People have to pay to get rid of that stuff so if you can make it your fuel there's money to be made. Hydrothermal gasification or liquification both seem promising for that.