Which is best for you?
Because Universities want to make sure you have the English language skills necessary to study at their school you need decide which test to take. Which test depends on what kind of tests your excell at, as well as where you plan to apply. You need to consider British versus American English. Since most think english is english it is not the case. If you are more comfortable with US english, the TOELF is a good bet for you, Are you better at multiple choice or copying down, IELTS favors people who have good memories and think more concretely. So do your research and pick the test that fits you.