Larger Midterm Win: 1994 for the GOP or 2006 for the Dems

[Virginiá]

1994 was more meaningful in the grand scheme of things but Republicans also received less votes nationally, as they usually do compared to the Democratic Party's waves.

Despite that, Republicans in 1994 still won a larger Congressional majority than 2006, given that they won more Senate seats overall even with a few less House Reps.

I'd have to go with 1994 here.