I'm a University student in Ontario now, but I moved to Ontario from San Antonio when I was a kid (with a year spent in Detroit Michigan before moving across the river.) What we found was the School's in Texas were a year behind Michigan, and about where Ontario school's were, the jump between states was bigger over-all than the jump between countries. As for public versus catholic I was in a Catholic school from fifth to eighth grade, and then I switched to a public high school, in all honesty, apart from having to take religion and wear a uniform, I didn't notice much of a difference. Something to keep in mind though, we moved back to Canada (I was born here btw) when I was in third grade, being raised bilingual I went to a French Catholic school, and as a whole we found that they were significantly ahead of the schools in either Michigan, or Texas, as well as both the public and catholic boards.
To sum up k-1 Texas (Yeah Behind Michigan)
2 - Michigan (year ahead of Ontario and Texas)
3-4 Ontario French Catholic School (significantly ahead of the rest)
5-8 Ontario Catholic School (Comparable to Texas)
9-12 Ontario Public School (Also Comparable to Texas, no Catholic religion class, World Religions taught though)
The only reason I got out of the French Catholic board was because the commute was long and I was well outside the district. I think they may receive more funding per student, keep in mind the city I was living in is also a French Service Area within Ontario, so that could also play a role.
Boards I attended:
San Antonio ISD
Detroit Public Schools
csdecso.on.ca (Web-Portal System, Open Access, French Catholic Board)
Windsor-Essex Catholic District School Board - Learning together in faith and service.
Greater Essex County District School Board
In all honesty the quality of the website sort-of does reflect the quality of education, at least in Canada, although with colleges and universities here the inverse is true. Example
University of Windsor One of Canada's lowest rated universities, compared to
Home Page | McGill University - McGill University a world leading university and tied for best in Canada with the University of Toronto Saint George (my school, Trinity College), and the University of British Columbia.