It all depends on your own personal goals... Are you planning on going abroad? It all depends on what test you plan on taking really... To make it short and simple, the IELTS test is administrated by the British Councils. Therefore better if you're planning on going to England or Europe. TOEFL is administered by ETS, a US-based non-profit and is used widely by American and Canadian universities. And therefore more suitable for America or Canada. There are other differences though, for more info click on the link. Hope that'll answer most of your questions. http://ezinearticles.com/?TOEFL-or-IELTS---Which-is-Better?&id=925195

It's IELTS and TOEFL. Considering that the best University in the world is Cambridge, I'd choose IELTS exams. But, you know, it depends on what you want and what you are expecting with those exams.

TOEFEL

Are you considering taking one of them in the nearest future?