Hi! It really depends or what you need the exam for. If you're planning on going to the USA, it's better to take the TOEFL exam. If you're thinking of going to the UK or Australia, take the IELTS. Personally, I think the IELTS is more manageable, easier to approach.
I'm a professional English teacher and I've taught classes for both IELTS and TOEFL. So, if you have any more questions, message me.
Hope this helps,