truth be told, its your personal preference ;p
the aquila is basically an aerocool deepsilence (different brand, different external looks)
the cm n200 is a pretty decent budget case (with a window), and slightly smaller size than the aquila
also the cm n200 comes with 2 fans already preinstalled vs the aquila's 1
ports-wise, the cm n200 has 1 external usb3 ports (and 2 usb2), whereas the aquila as 2 usb3