Well then, let me enlighten you.
A Little Background
The basis Communism and Fascism are direct results of the fall of the Ancien Regime (the Old Order) in Europe, and the drastic changes brought about in the Industrial Revolution, as well as the Nationalism, and New Imperialism that the Industrial Revolution encouraged. This Nationalism is one of the causes of the First World War. WWI greatly weakened the already weak Tsarist Russia, and (as a direct result) caused the Russian Revolution that was won by the Bolsheviks (the Marxist-Leninists; led by Vladimir Lenin and Leon Trotsky). However, "modern" Communism didn't arise until the Stalin Era (not long after Lenin, in 1925), that is when one can see modern Communism rise. With Lenin's short reign in Russia, he didn't change much, and Stalin didn't exactly agree with everything Lenin envisioned. Stalin created his Five-Year Plan(s) to modernize (mostly Industrialize) the under-industrialized and pre-modern Russia left by the Tsardom. While Stalin's rule was very much a long, and brutal one, there is some sanity, and some good to the modern Communism he shaped.
Fascism isn't that different in its roots. It came about after the First World War, which left many nations in ruin, and economically destroyed. In 1919, the Treaty of Versailles was signed by the Allied delegates: Vittorio Orlando (Italy), Georges Clemenceau (France), David Lloyd George (United Kingdom), and Woodrow Wilson (United States). This treaty (as you probably remember from your high school history class) put the full blame of the war on Germany, there guess who suffered the most. However, Fascism's roots do not begin in The German Empire, or the Weimar Republic, but in Italy. Italy was promised a number of things for their support in the war effort (despite having been in the Triple Alliance with Germany and Austria-Hungary at first) but the Triple Entente didn't deliver. Italy put an enormous amount of their resources into the war, and when it ended, they lost everything. Italy (and Germany) was weak, the people were destitute, a huge percentage of people were unemployed, complete economic (and political) destruction. However, one man was able to put the peoples' minds at ease, and give them hope that their Italy could be great once again and that a new political ideology could help. Benito Mussolini is the founder of Fascism and is considered the first dictator of the 20th Century. But less about Mussolini, and more about Fascism. It has its roots in the Roman Senate with a bundle of sticks used as a talking piece, a bundle of sticks known as the Fasces. Whoever held the Fasces had the power in the room, thus Fascism is when one person always has the Fasces. The Fasces were a symbol of power in Rome, and what Mussolini wanted to do, is create A New Rome.
Now, What We've All Been Waiting For
The Communism that we will be looking at today is what I consider to be "modern" Communism. Russia, China, Vietnam, and Korea were all countries left weak and under-industrialized while the rest of the Western world moved on. Until the 20th Century, the population of these countries were almost all farmers, providing only what they needed to live, with a little surplus for the market. This thought had worked for centuries, until the Industrial Revolution. As other countries all over Westernized and industrialized for many reasons, these countries didn't. Weakened by war, foreign occupation/colonization (by the French in Vietnam, and the Japanese in China), and even resettlement (in Korea's instance). When their people were weak, the radical Communist agenda appeared to be their only option, and really, it was. Communism brought industry to all of these countries (some sooner than others), and brought ruined economies out of the muck (at least at first). Countries with weak, or even pre-modern, armies were radically changed to be larger, more efficient, and more modern. The USSR (being the dominant power in Eastern Europe and Asia) became Communist at just the right time, and right place to influence the whole world for nearly a century. As for pros, there aren't many (as is hard with radical political ideologies) but i'll try to sum it up; Communism brought modernization to previously weak and underdeveloped nations, and allowed for said nations to grow and solidify a military presence in the continent of which they reside.
I'm going to try to get to the point on this one. Communism is the top "rival" of Capitalist nations, making it an instant problem for half of the world (not so much now, but back in the 20th Century). Communist nations, historically, tend to become totalitarian states that then lead to further revolution (be it Cultural or Political) look at China, North Korea, and Stalinist Russia. While unemployment is low, wages are equal (and low) and businesses can't grow. The military position of most Communist governments (in the 20th Century) was Jingoist, very much a hostile and undiplomatic state, relying on military might to control problems. That is (more or less) the run-down on Communism.
Fascism is a lot like Communism when you look at it. They both greatly enhance the economy of the nation, create jobs through massive industrialization, and rebuild lost military strength (as well as Nationalism). Both their focal points are the plight of the working class. It's funny because of the fact that Fascists (historically) have despised Communists, despite their similarities.
The cons of Fascism are pretty much self-evident. One person holds all the power so if that person, let's say decides that the entire nation's problems are caused by a minority, and that that minority should be exterminated, then the people (who are almost all indoctrinated by that point) can't do anything to stop it. Fascists are (big surprise) also Jingoists, relying on military might to frighten (and even destroy) neighboring (or far off ones in Italy-Ethiopia's case) into submission. The age Fascism was short lived, however (thanks to the Second World War) but is still apparent in modern nations (primarily North Korea).
There ARE good things about two of the most (may I say) hated political ideologies in modern history, but to be honest, the cons outweigh the pros. But nevertheless, I hope this long, historical rant was somewhat educational.