Valmet M78 vs FN-D (w/ John Keene)

If you had to pick one, would you take a Valmet M78 (in 7.62mm NATO) or an FN-D (in .30-06)? Both are reliable and well-made machine guns and they use essentially the same caliber. The FN-D weighs twice as much, but has a heavier barrel and barrel quick-change capacity. The Valmet is lighter, but offers much less sustained fire capacity. Both have the same sights. The Valmet has a true semiauto selector setting, and also fires from a closed bolt while the FN-D fires form an open bolt and has only slow and fast automatic settings. So if you have to pick one, which would it be?