The main advantage of using a solid-state drive (SSD) over a traditional hard drive (HDD) is speed. SSDs utilize flash memory, allowing for much faster data access and transfer rates, significantly improving system boot times and application load times. Additionally, SSDs are more durable due to the lack of moving parts, which increases reliability and decreases the risk of data loss due to physical shocks. Their efficiency leads to lower power consumption, making them ideal for both consumer and enterprise use.