Which chamber of the U.S. Congress has more power?

The House of Representatives and the Senate of the United States have equal power but serve different roles:

Senate: Approves presidential nominations, ratifies treaties, conducts impeachment trials — including the impeachment of the President, but cannot initiate on its own.

House of Representatives: Initiates tax legislation and is the only chamber that can start the impeachment process, including the impeachment of the President.

Both chambers: Must pass the same version of a bill for it to become law.

They balance each other in the system of checks and balances; neither chamber is superior to the other.