It is a matter of opinion, as both sources have their pluses and minuses. The main disadvantage of nuclear power is the leftover nuclear waste, which cannot be simply gotten rid of but must be stored in special containers (that often leak nonetheless) for very long periods of time. However, some of the new fourth-generation reactors can run on what’s now considered nuclear waste, significantly reducing the amount and toxicity of it. Another thing that can always be pointed to is the chance of a disaster like the one at Chornobyl in 1986.
Biofuel obviously does not have the dangers or health risks related to radiation. It is also close to being carbon-neutral – as much carbon dioxide is taken up by the plants (biomass) and will be released on burning it, except for extra costs associated with power plant or engine conversion efficiency and the like. On the other hand, most biofuel comes from crops (such as corn or sugar cane) specifically grown for it. The crops could instead be used for food and/or the soil could be used for various other crops, and with the current food shortage and ever-growing population and attempts to stop deforestation (which is usually done to free up space for agriculture), it is a difficult choice.
In my personal opinion, those new generation reactors are the lesser evil. Just to note, once the world runs out of nuclear fuel (which is limited just like fossil fuels), nuclear power will disappear anyway. The truly good choices for energy sources are renewables like solar and wind power.
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