Putting the two together the key differences I can see are-
Kaspersky
-Frequent updates
-Behaviour Monitor, web scanner, quite firewall
-Highly Customisable
-50-100 mb ram usage
-Slow for first scan
F secure
-Uses Bitdefender Engine
-Deep guard is amazing hips with a silent firewall
-Very very fast scanning
-Lots of processes but about 60mb max
-Web Link scanner is amazing but only works in Firefox or Internet explorer
Kaspersky
-Frequent updates
-Behaviour Monitor, web scanner, quite firewall
-Highly Customisable
-50-100 mb ram usage
-Slow for first scan
F secure
-Uses Bitdefender Engine
-Deep guard is amazing hips with a silent firewall
-Very very fast scanning
-Lots of processes but about 60mb max
-Web Link scanner is amazing but only works in Firefox or Internet explorer