The Seasonic VERTEX GX-1000 is the objective winner of this comparison, securing victory in four out of seven evaluated specifications. Its most impactful advantage is the inclusion of the 12VHPWR connector, which represents a 100% improvement over the Seasonic Focus GX-850. While the latter remains a viable option, the former provides superior hardware compatibility for modern power delivery standards, establishing it as the more technically advanced unit across the majority of the measured categories.

Users should choose the Seasonic VERTEX GX-1000 if they require the 12VHPWR connector for modern high-performance hardware, as this feature is its primary functional edge. Conversely, the Seasonic Focus GX-850 is the better choice for budget-conscious builders, as it offers a 37% advantage in MSRP. Selecting between these two units depends entirely on whether your build necessitates the latest power connector or if you prioritize the significant cost savings provided by the lower-priced model.