Kaspersky is much better than bitdefender. i am part of security technical (corporate) and we trust kaspersky.
kaspersky not only blocking virus or other malware but it can prevent attack using exploit technique (attacked open port).
i already test exploit to other server that use kaspersky and well done kaspersky can block it.
exploitation is the highest our concern !! because when the attacker already get your computer using exploit technique , none of antivirus cannot detect it because it running in memory not create some file or other in hard disk. so the attacker can control your computer like administrator. you won't know if you've been infiltrated.
you can prevent this exploit using IPS.