Hertz is cheaper every time by me. If you have AAA, they give you a discount at Hertz too, in addition to waiving certain fees (young driver, additional driver, etc.). Similar discounts if you have a Merrill+ credit card. (We happen to have both.)
$246 is decent for a week. The cheapest I've gotten for a full week was $102 but that was a planets-aligning situation. I'd consider anything under $200 to be excellent, and under $250 to be good.