The AMD RX 6900 XT is the objective winner of this comparison, securing victories in ten out of thirteen measured fields. Its most significant technical advantage is its FP16 performance, which is 359% better than that of the NVIDIA GTX 1660 SUPER. This substantial lead in raw computational capability establishes the AMD RX 6900 XT as the superior hardware choice for users prioritizing high-end performance specifications across the majority of the evaluated categories.

Users who require the highest level of computational power should select the AMD RX 6900 XT to leverage its significant FP16 performance advantage. Conversely, the NVIDIA GTX 1660 SUPER is the appropriate choice for budget-conscious buyers, as it holds a 77% advantage in MSRP. By choosing based on these specific strengths, consumers can align their purchase with either the superior technical output of the AMD card or the cost-efficiency of the NVIDIA option.