Log the time the same way as in the UK.
So brakes off to brakes on.
You were either P1 or PU/T, nothing else. It can't be dual in an aeroplane that only requires one pilot.
One of you is P1. The other is either a passenger (or is PU/T if the other is an instructor and it was an instructional flight).
Its usually a good idea in these circumstances to agree before the flight who is P1. "If we have a real emergency I expect you to handle it since you are P1," says the instructor.