The be quiet! Dark Base Pro 901 is the objective winner of this comparison, securing victories in seven out of eight measured specifications. Its most significant advantage over the competition is its cooling configuration, which features 200% more included fans. This superior hardware density establishes the be quiet! Dark Base Pro 901 as the more robust option for users prioritizing out-of-the-box thermal management and component support compared to the alternative.

The Thermaltake S100 TG is the preferred choice for budget-conscious builders, as it holds an 81% advantage in MSRP. Users who prioritize cost savings over the extensive hardware inclusions found in the be quiet! Dark Base Pro 901 should select the Thermaltake S100 TG. Conversely, those who require the advanced cooling capacity and expanded feature set provided by the larger unit will find the be quiet! Dark Base Pro 901 to be the better investment.