The French Revolution of 1789 is considered a turning point in history as it helped spread ideas such as liberalism and nationalism but the revolution in 1848 resulted in a wave of revolutions throughout Europe. National unification movements and the idea of the rule of proletariat gained significant strenght through the Revolutions of 1848. It's true that the Revolutions of 1848 had less direct political impact but could we say that it was more influental in the long run?
I would be hesitant to say that the 1848 Revolutions were more influential than the French Revolution of 1789. While both push for liberal ideologies, they do so with different means.
The Revolutions of 1848 overall were good for Continental Europe with France becoming a Republic again while other nations in Europe (Such as Prussia and Austria) becoming Constitional Monarchies, which lasted until WW1. Arguably it stands that the Revolutions of 1848 had a longer, more visible impact through the foundation of lasting governments that gave people more rights.
However, the French Revolution is one of the most important events in world history, if not the most. The French Revolution had a lasting impact on the introduction of nationalism to the world, which became a major component to the 1848 Revolutions, the spread of liberal ideology through Europe due to the Revolution, and being a major inspiration for The French (and Europe in general) whom had one major Revolution in between the 1789 and 1848 Revolutins.
If anything, the French Revolution of 1789 was foundational and necessary for the Revolutions of 1848 to even happen.