"In all aircraft, swept wing or straight (excluding delta-winged aircraft), the best rate of climb is achieved when flaps/leading edge devices are fully retracted and the airplane is flown at the appropriate speed."
---agree with that, and that's basic.
but for the case i mentioned above, we depart from a airport located in a nice broad champaign- climb gradiant is not the priority factor anymore,but the time pressure/working load is.
thank u for your recommendation, anyway.