If you have a choice however, it depends on whether you are more comfortable with communication regarding yourself, your culture and your opinions or you prefer to focus on other topics. The IELTS writing and speaking sections tend to be more personal.
The exam features questions which ask you about your life, experiences, and opinions. You may have to answer a question like the following:
Who is a fictional character you admire, and why?
The TOEFL, on the other hand, tends to be a bit more academic in that you will have to perform tasks which focus on academic material then requires you to combine skills. You may have to read one article, listen to a recording on that same article and then verbally compare the two items you’ve just heard and read.
So, that’s my quick opinion, but if you’d like a more detailed comparison, check out the link below.