The Corsair SF1000L is the objective winner of this comparison, securing victories in six out of seven evaluated specifications. Its most significant advantage over the alternative is its modular design, which represents a 200% improvement in cable management flexibility. While the Corsair CV550 performs well in specific areas, it falls behind in the majority of technical categories, though it does maintain a 75% advantage regarding its MSRP, making it the more affordable option for budget-conscious builders.

Users prioritizing system versatility and advanced configuration should choose the Corsair SF1000L for its superior modularity and overall technical dominance. Conversely, the Corsair CV550 is the appropriate selection for those who require a basic power supply and prioritize the 75% MSRP advantage over the additional features found in the higher-spec model. Your decision should ultimately depend on whether you value the modular convenience of the former or the cost efficiency of the latter.