Thirty-Thousand.org

Relative to gerrymandering, it turns out that, as of now “neither party enjoys a significant aggregate advantage in either districting or geographical efficiency of voter distribution”. This refers to the net effect in the House of Representatives. That is, one party's advantages in some states are largely offset by the other's advantages in other states.

Brookings.edu: The gerrymander myth. (March 17, 2023)