First lets describe what each one of them mean:
Let's start with Nuclear Fission:
Nuclear Fission: The Splitting of Uranium Atom. In short, the splitting of heavy nucleus to form two or more lighter ones or smaller ones.
Nuclear Fusion: Now Nuclear Fusion is vice-versa , basically meaning its the combination of lighter Nucleus to form heavier ones.
Examples of each one:
Nuclear Fission : A good example for this one , would be the bomb drop at Hiroshima and Nagasaki.
Nuclear Fusion: O.K. we know that Nuclear energy is basically the energy source of star, so the only logical example i could give you , is our Sun.
Comparing both of them:
Nuclear fission: Generates enormous amounts of energy, and as stated in Nuclear Fission , all of that energy