The ASRock B850 Steel Legend WiFi is the objective winner of this comparison, securing more victories across the evaluated technical specifications. Its most significant advantage is the inclusion of PCIe x16 slots, which offer a 100% improvement over the alternative. By outperforming the MSI PRO B860M-A WIFI in seven categories while tying in five others, the ASRock motherboard establishes itself as the more robust option for users requiring superior expansion capabilities for high-bandwidth components.

Users prioritizing high-performance expansion should choose the ASRock B850 Steel Legend WiFi for its doubled PCIe x16 slot capacity. Conversely, the MSI PRO B860M-A WIFI is the better selection for those who specifically require additional PCIe x1 slots, as it provides a 100% advantage in that area. Selecting between these two motherboards depends entirely on whether your build configuration relies on primary graphics or secondary peripheral expansion cards.