Looking at performance and features we want to find the hair straightener that is going to work the best for the most amount of people. While some features are going to be good for everyone, like even heat distribution and floating plates, we are also looking for some variety. Afterall everyone has different hair, and each hair type benefits from different treatment. The only way to accomplish this is by offering the user choice.
For the most part, both GHD and Cloud Nine offer those one-size-fits-all features. Every classic straightener these brands range come with auto-off, snappy heat up time, floating plates and technology to provide even heat distribution. Every straightener from GHD and Cloud Nine have auto-off features called 'Hibernate' and 'Sleep Mode' respectively. These kick in after 30 minutes, apart from the GHD Chronos which switches off after 10 minutes. They also all have floating plates, which just means there is a space between each plate allowing the hair to slide through without getting crimped and caught. Plus they all heat up within 35 seconds, although Cloud Nine's Original Iron is the fastest at just 20 seconds.
Where the brands really differentiate themselves is within temperature choice. Cloud Nine allows for degree level temperature control, ranging from 100°C - 200°C on every device apart from The Touch Iron which has a smaller range of 165°C - 195°C. GHD on the other hand uses what it calls "the optimal temperature" which is 185°C. The problem is that 185°C isn't optimal for every hair type. Thin, fine hair can benefit from much lower temperatures between 120°C - 140°C, while coarser, thick hair can handle upward of 200°C and may need it to hold a style.
According to GHD's various product pages, the majority of the brand's testing has been done on brown caucasian hair, so if that isn't you then the temperature may in fact be suboptimal. Plus, the damage from this temperature was testing against a "competitor styler working at 235°C". Hair can start to melt at 228°C, so that doesn't really seem like a fair comparison to us.