Speaking as someone who has active subscriptions to both Norton 360 Multi Device and Bitdefender Internet Security....
Guess which one I use, and ask yourself why I'm posting on a Norton Forum 
Norton 360 latest release: Solid, stable, reliable, well made.I can count on Norton. I feel confident in it's abilities. Very good support.
Bitdefender Internet Security 2015: One of the best AV engines out there, not going to lie. Top 3 easily. Not stable, not solid. I don't feel confident using it. Support is slim to none if you have an issue. Ridiculous resource usage. I don't care how fast my PC feels with it, it shouldn't need close to 300MB of memory sitting at idle. Pot luck if certain features work at any given time.
Norton is my go-to. My rock. The new Beta is shaping up to be good and I can't wait for release. Whatever you choose, ultimately it's a user choice, and Norton isn't a bad one.