OMG!! Camry, of course.
I drive a Camry and almost got run over the last time I rented a Malibu. I tried to change lanes with little clearance like I frenquently do with the Camry. The Camry of course has enough power to pull you through to safety almost immediately but the next thing I know a big ass truck is honking it's horn behind me!! OMG. Too bad I'm probably about to rent a Chevy (Aveo) again, there's a reason they tend to be the cheapest in the rental agencies
I wouldn't get an Accord over a Camry. The steering is too stiff and my Camry has endured much more abuse than my Mother's Accord when it comes to functionality. However, little thingies here and there like radio antenna, CD player, and a couple non-essential mechanical parts might tend to break down more easily on the Camry.