The Flex 14 has an HDD storage medium which is better than most 2 in 1 laptops that have been available for a similar time to it. Most 2 in 1 laptops that came out around the same time as 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 that are a similar age to the Flex 14.
Amongst comparable types of laptop the best storage medium is SSD.
Laptops with a better storage medium that might also be worth considering include the Lenovo Yoga (SSD), or the HP Pavilion x360 (SSD).