You could probably go either way. Drift roses are tough. I just buried some roses in their pots for this winter but only because I just transplanted them into their current pots a couple months ago and don't feel I have sufficient roots to get through winter if I take them out of the pots and they get transplant shock.
Your roses should be big enough to transplant now if you prefer and just make sure to put mulch over them to help them stay warm through this winter.
