The Kbox is limited on the wattage selection meaning you can only select (8W, 13W, 20W, 25W, 30W, 35W or 40W) where as the Subox Mini you can dial it in from 7 to 50w in 0.1 increments. That said, I would wait until Kanger gets the center pin issue solved, it is said they are going to have a spring loaded CP soon on the Subox Mini. They are known to not connect with other tanks as they get pushed in too deep.