Similarities: All three revolutions served to decrease monarchical authority. All three revolutions allowed for bigger citizen participation in politics. All three revolutions gave more rights to their citizens.
Differences: Decrease of monarchical powers: The glorious revolution only severely reduced the power of the monarch, whereas the other two (French and American revolutions) effectively removed the monarch. The Glorious revolution and French revolution led to immediate change, whereas the American revolution only led to an institutional change. Women were still considered property of men, and only rich white male land-owners could vote in the new American Republic.
You will have multiple answers, the following are: 1. Historians with different perspectives 2. Historians with different points of view 3. Historians with varying personal biases 4. Historians with different interests of cause and effect