Being bilingual is so important. If you currently live in an english speaking area (such as Toronto or Vancouver), then you're child will pick up english easily. We'd suggest that sending your child to a French school would be the better option to ensure that he learns both languages fluently. However, if he will be immersed in French (outside of school), than an english high school may be the better option to provide him with more opportunities once graduating.
For most accurate results, use the search tool and in the advanced section, select "FRENCH" as language of instruction. This will return a list of French language and bilingual schools.