Legally, in Canada, you are supposed to dump solid bowel movements down the toilet even with disposable diapers. Feces is not meant to be in our landfills. All diaper packages in Canada instruct to flush solid waste.

With cloth diapers the general rule is that if it's solid enough to roll off the diaper without being scraped then into the toilet it should go. Otherwise, let the washer do the work. I've cloth diapered my 4 children.