I can say with experience that the Zephyrus has more airflow. Especially when the RBA is in use. Adding larger Cylon slots in the base of the Starre will only help if they made the ID of the coils larger as well, because that is the choke point in the Starre. This would be physically impossible to do while using the same Atlantis coil structure. This is why YouDe increased the outside diameter of the threaded base of the coil heads and RBA in the Zephyrus. The coil heads are still a choke point because of all that cotton stuffed in there to feed those coils, but the RBA will allow a LOT of air to pass through if you keep the coil ID down to 2.0mm. 2.4mm coils will fit, but they start to block the air.
I had been running a dual coil 28g build in my Zephyrus that was 24 watts and was pleased with it. I wanted to wait and see if I could get that wicking working well enough that it could handle a higher wattage build. Yesterday, I rebuilt it with 26g and it vapes great at 38 watts. The only problem I can find is that now, I am spending more time filling the tank and charging my batteries. On the positive side, it chucks clouds and tastes like my Aeolus RDA.