Titanium flat irons are the highest quality you can buy. These plates are the quickest to heat up and will tame even the most difficult hair. Second to that would be tourmaline. If you want frizz-free hair that is silky smooth and shines but don't want the hefty price tag that comes with titanium, tourmaline is the way to go. Ceramic is a fine choice for occasional use, but not recommended for damaged hair.