https://www.gamersnexus.net/hwreviews/3335-be-quiet-dark-base-pro-900-rev2-benchmarks-review
Conclusion:
"The second revision of the Dark Base Pro 900 boils down to a power supply shroud and nicer fans. If this was presented as a minor update without increasing the price, like the changes Cooler Master made to the H500P, it would make sense. The original DBP 900 that we reviewed was great and earned our Editor’s Choice and Quality Build awards, and we let the price slide because it’s clearly a luxury item. Still, $250 was a lot of money, and Be Quiet is asking $20 more for a near-identical case.
In performance, the Rev 2 has much better GPU cooling results than the Rev 1, but that’s because the Rev 2 has faster fans. 140mm Silentwings 3 fans sell for more than $20 apiece on Newegg, so upgrading an original DBP 900 to match the Rev 2’s performance is an expensive proposition. Cooling performance is the single best argument for purchasing the newer revision instead of the older, but it only applies if the fans are run above 1000RPM, which silence-focused Be Quiet customers may never do.
The Rev 2 is a better-performing case with a few more features than its predecessor, which we already liked. If all that together is worth $20 and making PSU installation even more annoying than it was, we like the rev 2 as well."
Also, QFT:
"The loudest thing in your case are your fans and they produce low-frequency sounds, not the high-frequencies that the sound-dampening material on some of these 'silent' cases could help with.
In my experience 99% of the time the 'silence' focused cases are the loudest ones simply due to their restrictive airflow: The fans will have to run at a higher RPM in order to cool your components therefore defeating the entire purpose of them unless you only care about idle noise levels which any other case, silence-focused or not, can match or better."
A good chassis from the same party(be quiet!) is their Pure Base 500DX. A good one from a different party: Phanteks P600S.
Yeah, I know mesh chassis aren't to everyone's liking(aesthetically), but if one is to make an argument for thermals... there's really no contest there, aside from open bench.
If you want a chassis with a solid - or near solid - front panel, know that you will be making a compromise in thermals.