The Seasonic VERTEX GX-1200 is the objective winner of this comparison, securing victory in five out of nine evaluated specifications. Its most significant advantage over the alternative is the inclusion of the 12VHPWR connector, which represents a 100% improvement in connectivity capability. While the Seasonic Focus GX-850 remains a viable option, it only leads in one category, specifically offering a 48% better MSRP compared to the higher-capacity model.

Users prioritizing modern hardware compatibility should choose the Seasonic VERTEX GX-1200 to utilize its native 12VHPWR connector support. Conversely, the Seasonic Focus GX-850 is the better choice for budget-conscious builders who do not require the additional power overhead or specific connector standards provided by the higher-tier unit. Selecting between these two power supplies depends entirely on whether your build necessitates the latest connection standards or if you prefer the cost efficiency of the lower-priced model.