which preparing vs which is preparing

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Some examples from the web:

• Parliament is thus sending a clear message to the Commission, which is preparing the forthcoming guidelines for cohesion policy after 2013.
• However, as is customary, we intend to carry out coordination and cooperation work with the Office for Democratic Institutions and Human Rights of the OSCE, which is preparing a long-term observation mission.
• Instead, they will have to be dealt with when the Commission submits new proposals on comitology or by the Convention which is preparing the forthcoming revision of the Treaties.
• Prime Minister Qurei also outlined the work of the Palestinian Elections Commission, which is preparing for elections in the Palestinian Territory in the coming months.
• The Member States of the European Union are also playing a very active role in the meeting of the United Nations Commission on the Status of Women which is preparing the United Nations General Assembly Special Session on women.
• The Committee on Employment and Social Affairs, which is preparing the recommendation to all Members of the European Parliament, takes a different view.
• Then I will end up rotting in a cell somewhere instead of I should be doing, which is preparing for my audition tomorrow.
• If you make that comparison, the Amsterdam Treaty includes a dozen or more significant steps forward, even if it falls short on one major point which is preparing for a wider Union.
• In this way, at least a serious attempt is being made to give the opposition, which is preparing for a new round of demonstrations, a shot in the arm.
• 60 years since the establishment of NATO, the imperialist war machine and threat to peace throughout the world which is preparing to mark its 60th anniversary with a celebratory summit in Strasbourg.
• The EU, within the framework of NATO, will take part in imposing a new world order which has little sympathy for the fate of the Palestinians and which is preparing to effectively endorse the liberalisation of rail transport and postal services.
• Progress in setting up this court depends on the negotiations in the sixth committee of the United Nations General Assembly, which is preparing a draft statute for the court.
• Fourthly, there is a need to also contribute to development in North Sudan, which we must not forget, and which is preparing to draw up a new constitution.