An important facotr is Mars uses SMD Epistar chips where as Kingbrite uses Samsung LM301B or LM301H chips. The samsung LEDs are superior in converting watts to light photons and not just into heat output. Essentially that means watts alone doesn't determine how good a light is.
I'm not sure where you are getting your numbers on the costs.
- Four 288 boards(480 watts) will not cost more than 320 USD or 424 CAD and that includes shipping
- Two TSW2000(610 watts) according to your discount would cost 423USD or 560 CAD(unsure if that includes shipping)
The
TSW2000 uses more energy, produces less efficient light and costs more upfront. There really aren't any positives going for it in my opinon.