Well, how do you know which one fits you best. Mostly, security issuesdepend on the security leaks in the browser not depending on the firewall, I think. I've tried Sygate, ZAPro, Norton, Tiny and alls sorts, and must admit, Norton was too strict, but the others worked well. However, I didn't like Tiny, since, I think it didn't really provide excellent protection. Norton does, however, still, to be able to download from cdrsoft.cc Ihad to turn it off, it blocked any ftp connections, maybe there was something wrong with the settings. Is Kerio really that good?
Bye