Chi Ultra Flat Iron vs. Babyliss Pro Nano Titanium Flat Iron?

I am in the market for a new flat iron, and I'm looking for one that holds a consistent heat and doesn't damage your hair. I also want one that will last me a while. I've narrowed it down to Babyliss or Chi, but don't know which one is better. If you have a suggestion for a different flat iron it would also be greatly appreciated. Please help!