I am not impressed with techradar.com ratings. I was talking about AVTest and AVComparatives. Along with West Coast Labs, Virus Bulletin, NSS Labs, etc.
The problems I had with Bitdefender was that in more than one trial of the program it appeared to be very buggy. I had to repair it and one time I thought I had wrecked my computer with Bitdefender.
Kaspersky is very good. But I think Kaspersky has a few issues running on a 64 bit operating system.
At this time I think it is hard to beat ESET.
But no AV program is invincible and if somebody downloads enough junk and goes to enough bad websites they are going to get their computer infected with malware. You have to be careful just updating Adobe software. Adobe has included the Ask Toolbar in some updates.