I have a chi flat iron and sedu flat iron, and I'm sorry I have no experience with HAI. If I were to choose the better of the sedu or chi, I would go with sedu because it is an ionic ceramic flat iron and because of it gives my hair a really nice shine and silky finish that the chi does not deliver. The upside of the chi is that it seems to work slightly faster (might get a little hotter) and that its better to use when I want to flip my hair out or curl it in. Buying the chi though, you can't go wrong...it makes the hair very straight and works great, I just recommend the sedu even MORE because it seems to do less damage to my hair and make it shine! Good luck.
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