Kayaks are not really more stable than canoes. They are, however, more recoverable. A closed hull takes on less water than an open one. In a kayak, you are pretty much stuck with the position of the seat. In a canoe, you can change your position for comfort or to meet changes in conditions. Canoes are also more flexible, in that you can load several people or one or carry significant cargo INSIDE the boat. I have rolled many kayaks but never yet turtled or filled a canoe.