Ranking committees can be very difficult, because a committee could be effective in one Parliament and not effective in the other, without any changes other than the members. A committee can go through a very effective phase and then slip off into something that is ineffective.
If I had to generalize, I would say that Canada is ranked very high. We are continually invited to showcase some of our work at the Commonwealth Parliamentary Association's yearly conferences with the group within the Commonwealth Parliamentary Association that focuses on public accounts committees specifically.
We implement many of the recommended good practices at the federal level, so I would say that your committee is one of the best in the world. The U.K. is typically touted as being the top committee; they function in some ways similar to Canada, and in some ways they're a little different, but I would say that Canada's is right up there, close to that, when it is operating effectively.