Professor Lijphart published a very influential paper in which he looked at policy outcomes. He found basically no difference. They get at things differently, but it's not as if the economy performs better. So the strong majority government doesn't necessarily give you better public policy. G. Bingham Powell wrote a book in which he actually found that countries that elected representatives under PR tended to hew to what the median voter wanted. The median voter has a special place in democratic theory. With the median voter, where half of the voters are on one side and half the voters on the other, that position should win any majority vote. He found that the policies put out by PR governments tended to hew better to that than any other system. I will note, though, that he did find that there was one exception under first past the post systems, and that was Canada, actually did surprisingly well under first past the post. But that, I would argue, has to do with the sad situation we have, in which the Liberal Party has tended to be dominant historically and has been in the centre. That's a weird, freaky Canadian thing.
On August 22nd, 2016. See this statement in context.