My number one plane not to HO would be the one coming at me. The chance of getting out undamaged don't out way the chance of takingthe enemy out.
However, to seriously choose one, the CHog is by far the worst. With the Quad-20mms and a plane that sucks up damge like a bullet sponge, coming out on top of a HO with it is greater odds than the Detroit Tigers going to the World Series and winning.