Which app should I select when inserting my phone into the car dock?

I have a Tasker profile conditional on the phone being in the Car Dock. When I insert the phone in the dock, I sometimes get a prompt to choose which application to launch -- either Tasker or "Smart Dock", a built-in app. (When I don't get the prompt, neither seems to be notified). There is also an option to make the setting stick. I want Tasker to be notified, but the built-in app to launch. Which should I choose? edit: I get the same prompt when removing the phone from the dock.