Size Comparison
Yes, the Argentinosaurus was bigger than the blue whale in certain dimensions. Estimates suggest Argentinosaurus was 98 to 130 feet long and weighed 80 to 100 tons. The blue whale, the largest known animal, can grow up to 100 feet long and weigh up to 190 tons. However, Argentinosaurus was likely taller and had a longer tail, taking up more space and potentially displacing more water.
Conclusion
Argentinosaurus was bigger than the blue whale in terms of size and displacement, but not in terms of mass.