The Phanteks Eclipse P500A is the objective winner of this comparison, securing victory in five out of eight evaluated specifications. Its most significant advantage lies in its cooling configuration, as it provides 100% more included fans than the alternative. This superior out-of-the-box airflow setup makes it the more comprehensive choice for users prioritizing immediate thermal management without the need for additional hardware purchases.

Users should select the Phanteks Eclipse P500A if they require a ready-to-use cooling solution that maximizes airflow through its included fan array. Conversely, the Thermaltake The Tower 300 is the better option for builders who prioritize specific hardware clearance, as it offers an 11% advantage in maximum cooler height. Choosing between these two cases depends entirely on whether your priority is the convenience of pre-installed cooling or the ability to accommodate taller CPU air coolers.