There is the Phanteks Enthoo Pro M as well as the Enthoo Pro so are we talking about the latter or the former? I'd say the 450D as the airflow on it would be unobtrusive as well as having one more SSD mounting locations at the back of the chassis while the Phanteks Entho Pro has more 3.5" drive mounting options then the Corsair chassis. If you're going for the Phanteks the second 2.5" drive mounting location will require you to buy an add on 2.5" drive tray = more expenses.