I always go out & back in through the Westin. It's nice to get out doors & enjoy a cigarette in fresh air (yeah, oxymoron, I know) - but after you've been sitting in a tube for a while or connecting from one airport to another, it's good to get some natural light & feel the breeze. The security line at the Westin is always empty (never more than 1 person in line) and they don't make you take off your shoes at that line. I recommend the Westin - besides, it's got a cool interior.