I'm a fan of Amazon Kindle for English language readers because it has the best selection and prices for ebooks in English but I don't know if Kobo or others may be better for Canadians who want to read in French. Amazon.ca seems to have a good selection of books in French but I'm not familiar with other ebook vendors in Canada.
This article claims that Kobo has a much larger selection of books in French than does Amazon:
http://www.teleread.com/paul-biba/ho...otr-kowalczyk/
My choice would be the Kindle Paperwhite if you're satisfied with content selection and prices for French language books in the Amazon.ca Kindle store.