I think convection is more efficient for your herbs as it only vapes when air goes over it, while conduction vapes all the time. If by that definition, it is conduction. On the other hand, convection is inefficient when it comes to power. I think if you know you herbs are always being vaped while the SK is on, there is not a lot of waste in the vape as you are extracting regularly.
I was always convection convection as all our table top units are convection. As I started to make a portable I had to abandon all convection as I could not get it to work in a nice small form factor.
One thing I learned after doing this, is for concentrates to work really well, you kinda have to have the conduction. So, some how in my opinion nature granted us the perfect design for both herbs and concentrates.
Now with the ability to stir the bowl, I wonder if that helps make the SK more of a convection. In my opinion, after using the SK for months now and the SSV for a decade, I now feel conduction, convection means not so much as long as you can always stir the bowl, and the herbs are heated to the temp allowing vape. As long as a vape works I think it is good. I think the SK is the best on the market as it works well with both herbs and concentrates, and is very easy to clean, switch between herbs and oils, has the ability to run near forever with the ability to change the batteries, oh and 7th Floor made it with love and passion.