Having your OS and Applications plus main data on an SSD makes a huge difference.
I have had all Seagates in my Mac Pro and have replaced them all. They all failed. Seagate replaced them, but it was a hassle. I now use WD NAS drives. Slower, but it's mainly for infrequently accessed data or files like my iTunes library, where the speed is not an issue.
I compared SSHD vs Barracuda and although there were differences in bench marks, I could not tell in real use.
My current setup is 3x4TB WD Red drives, 1 6TB WD Black for my full system - Yosemite and a bunch of repos, and then an add-on sled/bracket with 4 SSDs - mainly Crucial at various sizes - 1TB (El Cap,) 960MB (Windows 10,) 512MB (Lion & Windows 7,) 512MB (various VM machines.) The SSDs are controlled by two Caldigit FASTA 6GU-3 Pro cards.
I use crucial because I have not had any failures in about 12-15 drives I have used including my kids laptops.
I use an external 8TB USB 3 drive for CarbonCopy of the main system drives, and a dock to reuse the Seagates from warranty for backup and storage. Those are mainly SSHD - but it does not matter. I do not trust to run them 24/7.