Battle Bitdefender VS Kaspersky

[monkeylove]

Comparison chart, free vs. paid, for Bitdefender (scroll down):

Bitdefender Free Antivirus for Windows - Download Software

Bitdefender Antivirus Free offers powerful antivirus protection that is light on computer resources. The only free antivirus that you'll ever need!

www.bitdefender.com

Kaspersky article:

What is the difference between free anti-virus software and paid anti-virus software?

Free anti-virus for windows vs. paid anti-virus software. We explain the difference so you can make an informed choice about how to protect your computer.

www.kaspersky.com

I think they removed the chart, but I remember the contents similar to the one here:

Free Antivirus Software for all Devices | Kaspersky

Download the free antivirus protection with Kaspersky Free. This top-rated cloud antivirus protects your family against viruses, malware, ransomware, Trojans and other threats.

www.kaspersky.com

"Existing virus removal" is not included in the free version and everything else below it.

 

[mlnevese]

Are they both only signature based or do they utilize some other features?

No modern solution is purely signature based. They use heuristics, behavior monitoring and cloud analysis as well.