the SSD hard drive or the HDD hard drive

(An SSD (solid-state drive
is a type of nonvolatile storage media that stores persistent 

data

A hard disk drive (HDD), hard disk,
 hard drive, or fixed disk, is an electromechanical data storage device that uses magnetic storage to store and retrieve digital

comparing

An HDD might be the right choice if

• You need lots of storage capacity, up to 10TB 
• Don’t want to spend much money
• Don’t care too much about how fast a computer boots up or opens programs - then get a hard drive (HDD).

An SSD might be the right choice if

• You are willing to pay for faster performance
• Don’t mind limited storage capacity or can work around that (though consumer SSD now go up to 4TB and enterprise run as high as 60TB)