Not a simple question at all b/c there is interplay among various factors and you can't always optimize one thing w/out sacrificing something else - responsiveness, stability, toe and heel (pannier) clearance. Very rare for a good quality bike to have any significant handling issues, so primary focus is usually ride quality and fender/tire or pannier clearance. As for head tilt you have to combine that with fork rake to get trail before you can compare.