This is a tricky question, because there are so many ways in which the French Revolution and Russian Revolution were different from each other; it's difficult to discern how to organize a clear and coherent response. As a possible starting point, though, I would note that, while there were tensions within France before the Revolution unfolded, it had nothing approaching the depth of subversive activities that you would see in Russia, where Marxists and anarchists had been politically active going back into the 1800s. For example, Robespierre did not have a career as a professional revolutionary the way Lenin did.
You might also consider that the two Revolutions emerged from very different contexts. The Russian Revolution coincided with the First World War, and has to be understood accordingly. The First World War was a traumatic moment for Russia, who faced higher casualties than any other participant, and was thrown into severe economic strain. Furthermore, the second stage of the Revolution (the rise of the Bolsheviks) was closely tied with the Provisional Government's inability to end the war. This was one of the key rallying points Lenin used to take power. On the other hand, the French Revolution came about in a time of peace and was caused by a severe economic and fiscal collapse. However, even so, we should not entirely forget the role war played in the French Revolution. Wars such as the Seven Years War and the American Revolution contributed heavily to the severity of France's economic distress, and while the events of 1789 unfolded in a time where France was not in any military conflict yet, the same cannot be said as the Revolution evolved. The Wars of the Coalition are a central and critical part of the Revolutionary story.
Finally, I would mention a bit about outcomes. After the fall of the Napoleonic Empire, the Congress of Vienna restored the Bourbons to power (with later Revolutionary tremors continuing throughout the Nineteenth Century). The Bolsheviks, on the other hand, created a lasting political regime, which would hold superpower status across the Cold War era.