Historically, Symantec was the best anti-virus (back to the Win 98/Win 2K days) but became quite bloated and intrusive as their company grabbed the majority of the market. Soon alternative AVs started to become more and more popular (Kaspersky, NOD, Avast, Panda, etc) and Symantec/Norton and their multitudes of overpriced protection software were no longer a good value to the average user. That said, they made a decent comeback with 360 (all in one protection) but never recovered their majority of the market. I honestly have never went back to them but have heard from others that the software works well and balances between resources and protection quite adequately.
There are several good sites that will give details pertaining to the AVs effectiveness, total protection suites are here
, and as you can see MSE scores very low on almost every test. "You get what you pay for" and "seen and not heard" come to mind when opting to install software of this type. You'll also see that Norton continuously scores quite high these days, a good note for Symantec. Best Free Anti-Virus
Both paid and free AV suites and standalone AVs, click the headers in each category to organize between best protection, performance, and usability here
I am always a little weary of any test sites since they tend to be biased toward whichever company is the friendliest to their site
But conduct your own searches also, I know your intuitive Buster