Posted 03 January 2014 - 01:49 PM
Usually Icebreakers are restricted to a specific category of ICE, sentry or barrier or code gate; AI's are restricted differently, technically able to break any type of ICE as long as it fits that AI's particular restrictions.
Atman: Must match ICE strength exactly to break, requiring support or awful ICE selection to be truly versatile, expensive to set high strength
Crypsis: Needs to be spun up to break multiple ICE in a run without crashing, Virus counters can be cleared.
Darwin: Needs to be fed gradually or supported, Virus so clearable by Corp, relatively expensive to break each routine
Knight: only breaks one ice at a time, relatively expensive per subroutine
Wyrm: ridiculously expensive to break each subroutine, but supports fixed strength breakers or parasite and ok with e3 implants
Deus X: Not an AI, but breaks specific subtype (AP, which usually do direct damage) or alternative use to soak any amount of Net Damage from one application of Net Damage.
No one breaker does it all on its own, each one has its own strengths. Pick the right tool for your deck.