If I were creating my own government...

I would use parliamentory government, where executive is the leader of the dominant party in legislature. It is because the executive is almost a part of the legislature so that executives and so legislature will get along well with executives. In other words, the legislature will provide the law that will support the executive's policies with majority, unlike limited presidential executive where the other parties Congress always checks and delays the president's policies.

http://www.telegraph.co.uk/news/election-2010/7546363/Business-leaders-join-push-to-scrap-jobs-tax.html.
Here we can know that the government is pressurized by other interest groups, such as businessmen, but no mention of other political opposition in preventing the current executive, Gordon brown's cabinet. It leads to the suggestion that the executive is pretty in superior position with the parliament and so powerful enough to pass the law in agreement with the parliament.

http://www.timesonline.co.uk/tol/news/politics/article6914945.ece
Here the British prime minister Gordon brown announces the harsh immigration policies. From this article, there are also concerns from other ethnic groups but there is no mentions of parliament not supporting his policies, meaning that the immigration policies will be activated no matter what other interest group. Hence it shows how easy the parliamentory executive to execute the policies with approval of the parliament, because the executive is the representative of the dominant party in the parliament.