Both cases have solid front panel and there's little to no difference in airflow.
I, personally, don't like solid front and top panel cases since they handicap the PC's airflow considerably. While this can be countered with high static pressure fans at high RPM, those fans also increase the noise coming out of the PC case, just to have proper airflow in such solid panel design cases.
For good airflow PC case, look towards;
Fractal Design Focus G, specs: https://www.fractal-design.com/home/product/cases/focus-series/focus-g
Corsair 450D, specs: https://www.corsair.com/eu/en/Categories/Products/Cases/Obsidian-Series™-450D-Mid-Tower-PC-Case/p/CC-9011049-WW
Phanteks Enthoo Pro M TG, specs: http://www.phanteks.com/Enthoo-Pro-M-TemperedGlass.html
or any other case with mesh front panel.
As far as my personal opinion about Define R5 goes, i see that it's just a plain black box with solid front panel. I don't like those bland, tasteless PC cases at all. For me, PC case must have it's own unique theme that makes it stand out from the rest. And as i said above, solid front panel case will have handicap in frontal airflow. Though, it has good fan support, supporting 140mm fans all around, including bottom fan mount. Also, 180mm of CPU cooler clearance is enough even for the biggest of air coolers. But where it falls is the price. At current date, Define R5 costs $126 while for comparison, Corsair 450D costs only $90,what do u think of the Define R5?
As far as my personal opinion about Define R5 goes, i see that it's just a plain black box with solid front panel. I don't like those bland, tasteless PC cases at all. For me, PC case must have it's own unique theme that makes it stand out from the rest. And as i said above, solid front panel case will have handicap in frontal airflow. Though, it has good fan support, supporting 140mm fans all around, including bottom fan mount. Also, 180mm of CPU cooler clearance is enough even for the biggest of air coolers. But where it falls is the price. At current date, Define R5 costs $126 while for comparison, Corsair 450D costs only $90,
pcpp: https://pcpartpicker.com/products/compare/9JvRsY,sjX2FT/
Overall:
Aesthetics - 0/5
Airflow - 2/5
Fan support - 5/5
CPU cooler clearance - 5/5
Value - 2/5
Like i said, it is my own personal opinion. Do read what i say.Why do you rate the airflow 2/5???