The MSI MEG Z890 ACE is the objective winner of this comparison, securing two out of three spec victories. Its most significant advantage is its maximum memory capacity, which is 100% better than that of the alternative. While the ASRock B760M PG Lightning/D4 manages to win one category, the superior memory support provided by the MSI MEG Z890 ACE establishes it as the more capable hardware option for users prioritizing high-capacity memory configurations.

Users who require maximum memory support should choose the MSI MEG Z890 ACE for their build. Conversely, the ASRock B760M PG Lightning/D4 is the better choice for budget-conscious builders, as it offers a 92% advantage in MSRP. Selecting between these two motherboards depends entirely on whether your primary requirement is the expanded memory capacity offered by the MSI board or the significant cost savings provided by the ASRock model.