What is your go-to Killer solution?
There's an easy answer for Fracters; just get a Corroder. If you can't afford the influence and you're Shaper, pick up your choice of Snowball, Inti+Datasucker or Lady+Recursion. Criminals will usually have to import, but a single Corroder + Special Order makes this mostly painless.
There's also an easy answer for Decoders: just get a Gordian Blade, or Zu if you prefer. Yog+Sucker can be strong also. Passport + Rex is viable in Criminal.
But Killers suck. The Corroder-equivalent (Garrote) is 3 influence, has more than triple the cost and takes up 2 MU. Ninja is touted as the most efficient, but it is expensive as hell to use; 10 credits to break Archer, 7-8 credits to break a Komainu. 7 to break a Tsurugi. 5 to break Architect. You're never happy using Ninja.
Faerie rules. It is by far the best Killer in the game, but it requires a permanent solution on the side. It's also unsplashable at an influence cost of 3; and let's face it, you want 3 Faeries in your deck.
Femme + Datasucker is 10 credits to install; if you're not getting good value out of the Femme bypass, you're in frowntown. Mimic + Datasucker is a strong option, but it eats up 2 MU, 4 inf (minimum) and 4 deckslots. You also risk getting locked out if there's a Sentry protecting each central.
Dagger and Switchblade are very deck-dependant, and my attempts to make Cloak+Dagger work have not been encouraging. Given that you can't break Archer before you have 2 Cloaks online, Dagger requires more support; either in the form of Ghost Runner (a temporary solution) or costly 3-inf Silencers. Cloak is very MU-hungry, and tends to demand support cards of its own.
Pipeline and Creeper are not viable economically, Alias is situational and Cuj0 is fairly bad (not to mention 3 inf).
The "least bad" of all these seems to be some blend of Mimic/Femme and Datasuckers. Which is not a satisfying answer; not every deck wants to run 3 Datasuckers.
What is your go-to Killer, and why?