The Phanteks G400A is the objective winner of this comparison, securing victories in five out of eight evaluated specifications. Its most significant advantage over the competition is the inclusion of fans, which provides a 300% improvement in that category. This substantial lead in cooling hardware makes the Phanteks G400A the superior choice for users prioritizing out-of-the-box airflow and thermal management without the need for additional component purchases.

Users who require extensive storage capacity should consider the Thermaltake S100 TG, as it offers a 50% advantage in 2.5" drive bays compared to the Phanteks G400A. While the Phanteks G400A is better suited for builders focused on integrated cooling solutions, the Thermaltake S100 TG remains the preferred option for those whose primary build requirement involves housing a higher number of small-form-factor storage drives.