The best header is the one that best fits YOUR application for whatever goals you want your car to reach. Usually, long tube headers give the most torque and horse power all across the board. Figure what YOUR car does NOW, and what YOU want it to do differently, then devise a plan of attack. Without that, you're just pissin in a fan. To just blatently say "Clifford is the best" is both misguided and just flat out WRONG. It might help you if you start a separate thread about what your car does now, what you want it to do and ask opinions from people who have similar setups how they attained their goals.
