The glamorous arrondissement is the reward for a late departure. The airport hotel is the reward for an early one. Gare du Nord is the compromise that keeps RER B honest.
At CDG or Roissypôle
Sleep here when the outbound long-haul leaves in the morning, or when you do not want the first and last act of the layover to be a train.
You can still RER into Paris for the daylight hours and come back after dinner. That shape suits a lot of 24 hour tickets better than a centre hotel.
The practical city base. You are on the RER, and you can walk or metro to the Marais without living next to a carousel of suitcases if you choose the street carefully.
Good for 24 hours and for the last night of a longer stay.