Great to see that you're into different types of energy! Certainly you've chosen an excellent field for your interests. Thinking about alternative sources is imperative, as you never know what we'll have twenty, fifty, even a hundred years down the road. I am no nuclear physicist, so I can't really provide you with an opinion about which source is better, but I would like to lay down some facts (and questions for you to think about) to help you with your research.
You probably already know this, but fusion (putting together a couple of atoms, in simplest terms) happens with the sun, whereas "natural" fission (the splitting of an atom, if you will) is rather uncommon. Fusion generally is more powerful than fission, which, in turn, is much more powerful than mere chemical reactions. What you're looking at are sources of super-energy that are possible to achieve because I personally like to think that with science, anything could happen!
So I wouldn't exactly agree with the claim that they're unreliable, but maybe more knowledgeable experts will weigh in.
In the meanwhile, here's a site that elucidates the many differences between fusion and fission: http://www.diffen.com/difference/Nuclea ... ear_Fusion
. It also delves into the cost, effects, and conditions required for each. I'm sure you already know a great deal, but take a look as you might run across something you didn't see before.
Hope your research goes well,
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