Pretty important to note that if your body's ability, flexibility, and core strength are not super great, a more upright position is going to allow you to transfer more power and remain more aero better than a more slammed position.

Anyone can get aero. Anyone can generate a load of power. It's a balance of the two, unique to an individual's body, that are going to create the best (read fastest or most aero and powerful) position for that rider.

That being said, a slammed and drop stem on a Roubaix will offer more saddle to bar drop than the default configuration of the cdale.
That also being said, you can't go wrong with either.