I could see a case being made for doing a bit of both. Let's say, for example, that two-thirds of the ridings were designated as first past the post. Then you could increase them somewhat, but not to the full extent that you would have to if you also increase the size of the House of Commons by, say, 10%. Then you might have 80% as the overall....
On October 7th, 2016. See this statement in context.