Compared to traditional platter-type hard drives, SSDs don’t have any moving parts. SSDs use much less power than hard drives, don't heat up much, and they don’t vibrate. 

On an average, SSDs are three or four times faster in sequential reads and writes.

You may not probably feel the difference between a top-end SSD and a decent one.

Experts suggest we don't buy an SSD with less than 250 GB of storage, because 128GB (and lower-capacity) SSDs are not cost-effective and don’t have enough room for most of our stuff - so many video downloads!

The Best SSD: Samsung 850 EVO (fast, five-year warranty, easy to use) FYI: amsung makes its own SSD controllers, firmware, and NAND

The second best SSD: SanDisk X400 almost as fast as Samsung EVO, cheaper)

The best SSD upgrade: Samsung 850 Pro (two times as fast as 850 EVO, great for video and other data-hungry files)