Listening part in IELTS or any exam is not so critical that you have decided to take that exam whose listening part is considered to be easier. Listening is not the matter, you get used to it in short time. In the case of speaking, look with which one you feel comfortable. I think, though, the speaking part is the most challenging part of an English proficiency testing system. You should be aware that tackling the speaking needs more practices compared with the other parts. So, take that exam you can handle its speaking part more readily.
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