if the keycaps are same profile, same thickness, same font same all except for double shot versus dyesub, then double shot is better. But dyesub is not so far behind since it will last super long (like forever really), you don't feel it and the color you can get is quite nice too. In the end, the only big difference is that you cant have some dyesub color combo.
personally, I would put more importance on profile, thickness, material than dyesub versus double shot.