cool avatar!

I've never heard of Franks. Sartre was more tangled up in politics than Nietzsche. sartre was all tangled up in contemporary French Communism and socialism whereas Nietzsche just didn't give a damn and said what he liked. Nietzsche was really involved with the analysis of Christianity as a slave morality.

Nietzsche was also more stylistic than Sartre and given aphorisms whereas Sartre is more technical and not at all fond of new starting paragraphs. A lot of Sartre's ideas are expounded in his novels, whereas Nietzsche's aren't - though Thus Spoke Zarathustra has the aspect of a story it's utterly fantastic. One of themes in Nausea is a confrontation with Humanism I think. The Reprieve is a novel based around the idea of "the Look" as expounded in Being & Nothingness, in the chapter The Existence of Others.

Both men had experienced war, but they were different wars/ sartre really confronted WWII and the tragedy of it, whereas Nietzsche seemed to revel in the destructive nature of war as an expression the will to power.

There are many differences between these two, these are some of them IMHO