A paid vs free? Anyway, even if it was full suite of bitdefender i would chose WSA over it any day. Bitdefender is to unstable, and last time i ran it, was a little heavy. WSA is light, effective "roll back feature a major plus" , and very stable, never a problem running it, matter of fact, for most novices around my area, it is what i recommend, as a set and forget AV that will serve them right.