I definitely prefer the DLH over PPH, but wouldn't pay $100 more, at least for comparable rooms. Do you know what you are comparing, room/view wise?
The difference in price between a standard room at PPH and a standard room at DLH is typically around $30/night. The difference is a little higher for a view room and a whole lot more for a conceirge. The rates vary a lot depending upon demand, but $100/night more for a standard or view room still that doesn't seem right for Oct. Perhaps DLH is already booked up for some special event, and so you are being quoted a view room and/or higher rates due to demand, compared to a standard room at PPH. One compromise is to book a view room at PPH overlooking DCA.