The Corsair SF1000L wins in 5 out of 9 comparable specs, with 2 ties. Its biggest advantage is 12VHPWR Connector (100% better).
Focus GX-750 wins in 2 specs (MSRP: 44% better).
Recommendation
Choose SF1000L if you want the best overall performance — especially 12vhpwr connector.
Choose Focus GX-750 if msrp matters more to you.