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Well, want do you want to do with it? I don't think any of the options are especially effective, but despite their limited capabilities they do perform different roles.
If you want to actually kill something then the Icarus lascannon is the best choice as it has a limited ability to pick and hit its targets. It's not so useful if you play against Orks or Guard, but most other armies will have flying targets to shoot at.
If you want to defend an objective or set up a refused flank then the Punisher Cannon is best, as it has enough shots that it will get at least a few hits. And since most infiltrating units are lighter infantry the Punisher can actually threaten them.
The Battle Cannon seems like the worst option, as it has too few shots to regularly get hits and does too little damage to threaten much. It would primarily be useful if your army is highly aggressive so most of the fighting will take place in your opponent's side of the table, out of the range of the Punisher Cannon.
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