I've seen several comparisons showing that Epic's prices are not actually lower than Steam's (in general).
Can't find them right now, and don't have the time to do a thorough comparison, but looking at the first three games on the Epic Store front page that also have Steam pages with prices seems to confirm this. That's "Oxygen not Included", "Vampire: The Masquerade® - Bloodlines™ 2" and "Outward", all of which are priced the same on both stores (€22.99, €59.99 and €39.99, respectively).
Can't find them right now, and don't have the time to do a thorough comparison, but looking at the first three games on the Epic Store front page that also have Steam pages with prices seems to confirm this. That's "Oxygen not Included", "Vampire: The Masquerade® - Bloodlines™ 2" and "Outward", all of which are priced the same on both stores (€22.99, €59.99 and €39.99, respectively).