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What’s better? The default auto cannons or the lascannons? Also, which missile rack? Ironstorm or defense? Thanks!

For Adeptus Titanicus or some other system?

For AT, after the deserved price hike in the last errata the Asterius isn't an obvious choice like it was previously. I'd personally take the cheaper magna-las because it still pumps out a horrendous amount of dakka down the field and has Rapid missiles, which suits its intended purpose as a long range support unit well.

For the same reason, I'd steer clear of the lascannon upgrade since you never want them to be that close to the enemy. If you're within 12", you'll eat melta cannon fire and powerfists which will destroy the Acastoi pretty quickly.