Not sure about cases now. Too much choice. Same re: coolers. Water/sealed fluid coolers are remarkably inexpensive.
Basic "water pipe" coolers aren't that much more expensive, because they have small radiators...
Which don't have any more surface area for dissipating heat than bigger dual tower heatpipe heatsinks.
Anyway in heatsinks for roughly same weight level of heatsink cooling power differences (for same fan and airflow) are usually rather small.
Some brands just charge lot more than others, like Noctua for NH-U12S...
Vs. Thermalright whose TRUE and Macho 120 basically perform as well.
For keeping dust away from components cheese grater cases are definitely harder than controlled airflow cases.
Until couple weeks ago I still had GTX680 graphics card (bought when it was new) and looking into heatsink fins there's barely any dust in there.
Despite of many years worth of power on time and hence lots of air having gone through heatsink.
(though having case on desk no doubt helps)
Also while not having as many holes for airflow, more closed noise dampening case can allow keeping heatsink fans at higher speed for same heard noise.
So little lower possible case airflow doesn't necessarily lead to higher CPU/GPU temperature.
For as long as heat of those isn't left to circle inside case.
From listed cases that Corsair definitely has airflow advantage from more open design than say BeQuiet or Fractal's Define R5.
At default two intakes fans makes sure of that by big margin.
But at the same time if you have case near you any noises of CPU/GPU fans leak out unmuffled.
So after adding second intake fan to Define, it wouldn't be anymore simple to say, if Corsair can keep CPU temperature lower for same noise.
That BeQuiet case again doesn't have real sound dampening.
While Fractal Design uses dense bitumen or similar material, which absorpts vibrations from panel and helps to dampen some airborne noise BeQuiet uses light foam...
Which can never prevent panels from vibrating because of lack of mass, while absorpting airborne sound for significant amount would need many centimeters of thickness.
Surprisingly Google translate can basically make understandable translation for those parts:
https://www.io-tech.fi/artikkelit/testissa-quiet-pure-base-600-window-miditornikotelo/#2
Such shame, because BeQuiet at the same time makes very good combination mat of mass damping layer and foam:
https://www.bequiet.com/en/accessories/62
(Silverstone's mat is useless "lighter than air" foam without enough thickness for anything)
