The most onerous issues about BD are the administration and licensing. If you just using one license, then that part won't matter. I challenge anyone to show a consistent "real world" difference between any of the top vendors protection wise.
BD also has more false positives. Both have horrendous tech support.
If ya get one for free and the other ya have to pay for ... that's a pretty good argument... well depending on the price ya pay (we pay < $10 per seat). I you not having any issues, it's hard to make an argument for switching. If it's free and you don't have to deal with BDs onerous licensing / installation issues, the argument gets weaker.
The last thing worth mentioning is how often you wind up troubleshooting. When a game or program has issues, you need to restore default BIOS settings, getting rid of any OCs, disable any mods or 3rd party apps associated therewith and **completely** disable the AV .
According to BD Tech Support, as confirmed by my own experience, this is a rather involved process. According to KA Tech Support, again, as confirmed by my own experience, this is a 3 click process. So if you don't run into this either, I'd stick with BD as long as it's free.
For me tho ... if BD was free, I'd still use KA because with the number of machines, after just one troubleshooting instance, I have paid for all my licenses several times over.