You might consider measuring the TV's water temp, then adjusting the Brazen to match it, just to remove that variable. You may also test them both with a lighter roast as well as a darker roast. And of course, get them brewing at the same time so you can sip from one cup and then the other; if you brew a pot in one, drink a cup, and then brew with the other, it will make it more difficult to A/B their output.