The TOEFL exam is widely accepted and run in over 130 countries and exam being offered several times a year in various location. It is said that this exam is the best estimate of one's english speaking and writing abilities. The content on the TOEFL test is 100% academic, with tasks that actually reflect what you’ll experience in a classroom

Also, i've heard that the conversation section of the exam is graded more fairly because the section is recorded and played back to 3-6 different ETS scorers.