They may cost more than a traditional hard drive, but SSDs have fewer parts that can wear and tear and thus last longer. They are also much faster than an HDD. In terms of portable SSD vs an internal SSD, it really comes down to how you work and your storage needs. If you need more than 2-4TB of storage, then an internal drive is probably your best bet. But for working on the go and having a secure backup, a portable SSD is definitely worth it.