Answer: Democratic ideas are ideas thought of by democrats. Republican are ideas thought of by republicans.
Explanation:
It's somewhat a matter of opinion, since many people have their favorites and it always looks good if you answer "Nelson Mandela". The truth is that after WW 2, the world got divided into a "Western" bloc under US leadership and a Communist bloc under the Soviet Union. The various US Presidents and Communist Party Secretaries all shaped the world in the Cold War era. A good candidate however is Soviet party leader Mikhail Gorbatchev, who practically single-handedly dismantled the old Soviet Union and thereby ended Communist rule over many eastern European countries. Americans tend to thank Ronald Reagan for that, but that is vastly overrating his actual influence on affairs. We Westerners like Gorbatchev for that, but in Russia he is generally seen as a weak leader and the man who 'sold out' Russia's global power and prestige and who was responsible for much of the following unrest until "thank God" Vladimir Putin took firm control and put Russia back on the map again.
None are "better" it depends on the country
one can work for another country, but not for this country, each has its good things and bad things
for example: communism vs democracy
the government controls everything in communism, giving the citizens no chance to voice their own opinions, however, that means everybody is "equal" in a sense
in democracy, there are poor people, and rich people, the poor people want more money, the rich want to keep their titles of "rich", which may spark hatred and other things.
These are two examples. Again, none of them are better than another, it really depends on the people.
hope this helps