The DELL Latitude 14 7404 has an SSD storage medium which is better than most notebook PCs of a comparable age and type to it. Most portable PCs that are a similar age to it have an HDD storage medium. Solid State Drives (SSD) store data in semiconductors on a circuit board rather than using magnetic or optical media. Solid State Drives have no moving parts which makes them very fast and reliable.
An SSD storage medium is actually the best storage medium across all portable PCs that are a similar age to the Latitude 14 7404.
The worst storage medium amongst comparable types of portable PC is HDD.