TOEFl is what I would choose rather than IELTS because 1. You finish the exam in 1 day unlike IELTS where u might be booked for an interview on a later day. 2. IELTS has an interview. An examiner will talk to you about random stuffs and u have to talk to him/her. This helps them assess ur listening and speaking. If the 2 above points are not deal breakers, u can choose IELTS, because I've heard the reading section is easier than TOEFL