A massive underwater uplift would be worse
Not the case apparently.
The highest wave height created by ocean floor displacement is about 50 ft. The wave is still incredibly dangerous and destructive due to the wave length, however.
The ones that hit Indonesia and such were only about 20 ft high, so a 50 ft tsunami would be the end of the world to anywhere struck by it.
High speed landslides are capable of creating taller and faster waves due to the energy they hit the water with and due to the amount of water rapidly displaced by both the land and the air that enter it.
I don’t think that these types of waves have the same incredible wavelengths of tsunamis though.