The HP Pavilion x360 has an HDD storage medium which is better than most 2 in 1 laptops that have been around for around the same time as it. Most portable PCs of a similar spec and age to it have an SSD storage medium. HDD is a traditional storage drive which stores the information on magnetic disks. HDD drives are slower than other forms of storage such as solid state drives (SSD) and flash drives.
An HDD storage medium is actually the worst storage medium amongst all portable PCs of this age and spec.
The best storage medium amongst comparable types of laptop is SSD.
Alternative laptops that have an HDD storage media currently available which you might want to look at include the Toshiba W30t which is cheaper; or the Yoga, or the Flex 14 both from Lenovo which has better reviews.
Laptops with a better storage medium that might be worth looking at include the Satellite U920t (SSD), or the U920t (SSD) both from Toshiba or the Lenovo Yoga 2 Pro (SSD) which also has a higher rating.