Chief of Naval Operations Adm. Jonathan Greenert makes the very valid point that having a very expensive aircraft to deliver a cheap bomb does not make economic sense. If the risk is that high, send a Tomahawk.
Two different arguments here. One is the smart platform+dumb weapon vs the smart weapon - the other is stealth.
Smart weapons have their place at the beginning of a camapign when the targets are high value and well defended, but you end up with the problem that you are using £1m weapons to destroy £5K targets. Smart platforms allow precision strike using dumb cheap weapons, they may be expensive but the return over time is cheaper, as long as you don't lose the platform.
The second argument is whether the additional security of stealth is worth the price.
If you use smart weapons during the first days of the campaign against high threat targets, do you platforms need to ingress and be stealth - particularly if, after the first few days, you hang external tanks, pods and weapons on them and lose the stealth anyway.