For aspirants who would like to study abroad especially in Canada, IELTS vs CAEL is the toughest option. They are both focused solely on English. So either IELTS for admission in Canada or CAEL for admission in Canada should be in the center.
The key difference is that CAEL is recognized only by universities for study in Canada around the globe as long as IELTS is only approved in Canada. And the expiry date for the IELTS is 2 years, although the date for the CAEL is not expired depends on the text.