If you use both to break Quandary:
Wyrm is 1+3c
FoN is 2c
Considering install costs, those are even at break #2
Now considering, say, Archangel;
Wyrm is 14c
FoN is 7c
FoN is better at break #1 \o/
The only codegates where Wyrm is better are str0, 1 and 2 monosub codegates. All the other one are better with FoN from the first break.
Now, kk, Wyrm is an AI. But if you use this for a killer, it's stupid because Sentries are where you see multisubs.
And if you use it against Barriers in the Corroder faction, it's not really better