The main political power in EU resides with the member states.

Most of EU countries are parliamentary democracies where executives are not directly elected.

EU Commission is an executive body for the member states with regard to the competences granted to EU by the member states.

EU Commission is confirmed by EU Parliament and can be also dismissed by EU Parliament in vote of no confidence.

USA is a presidential democracy where a lot of power resides with a single person.

Supreme Court Judge in USA is appointed for life and is supposed to be independent from the rest of the power structures.