Which reaction is easier to artificially create: fusion or fission?

A small amount of an unstable isotope, like uranium-235, is all that is needed to initiate fission. Reactors that utilize these fissile materials are used in 31 countries to generate 11% of the world's energy needs (World Nuclear Organization). Learn more about them here.

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In contrast, nuclear fusion necessitates the creation of a plasma of hydrogen or other light nuclei at extremely high temperatures. Once this is achieved, the question of how to contain matter at such temperatures arises.

Though science is gradually working through these issues, a working fusion reactor is still many years away. Until recently, scientists could only produce a demonstration of fusion in which the reaction released more energy than had to be put into the process that created the reaction.

Thus, while we have been using fission successfully for many years from a practical standpoint, the construction of a feasible fusion reactor seems to still be a long way off due to its numerous inherent issues.

Fission reactions are currently easier to artificially create than fusion reactions.