I had had some apprehensions before this test session, but the PSUs both eliminated them completely. The only thing I can point out is that 1500 watts of power is not really needed today. Configurations that might need so much power have no point in terms of performance. As our tests show, triple-GPU subsystems are not faster than dual-GPU ones.
But if you do think you need such a high-wattage PSU, any of the two tested models will make a good buy. They have good electrical parameters, deliver stable voltages with acceptable voltage ripple and are comfortable in terms of noisiness (comparable to modern mainstream 600-700W models). The poor compatibility with UPSes may be a problem but you can solve it by purchasing an UPS with a reserve of wattage.
The two PSUs from Thermaltake and Xigmatek are both based on the same platform developed by Channel Well and are in fact twin brothers in quality and electrical parameters. The Xigmatek is somewhat better in functionality: it has universal graphics card connectors, a highlighted fan, and a slimmer fan grid that creates less noise. The difference between the two models is really negligible, though.