Qunar has always been cheaper than Ctrip for flight deals. Qunar APP will automatically alert you of the best deals and/or when fares have dropped to your designated price.
As for hotel bookings, don't bother with Ctrip. Take advantage of current Booking.com promotion.
Get US$25 (162CNY) off every hotel booking worth over US$50 (~324CNY) for participating hotels using referral link: