Corvettes and strikecraft definitely do it fastest, since they can not be killed with Maw or Desperation. With carrier cruisers though you have to constantly be on alert for the titan micro phase jumping to your carriers and then mawing them. Very expensive to lose them that way.

Capitalships, especially antimatter draining one like the Dunov are also a good choices against most titans (just not the Coronata), though they are more for weakening the enemy titan than directly killing it.

If possibly, try to get the enemy titan to attack one of your planets with a phase jump inhibitor. While this might not work with a huge fleet, if he cannot destroy all the inhibitors it will me difficult for him to jump out of the gravity well. Otherwise, if you use Corvettes they can easily run down any weakened capitalship or titan, you'll just need to make sure he doesn't deploy a phase gate to retreat to his core planets.

Snipe and scatter shot for -8 armor (I think it works on titans) definitely helps. Just beware human players will try to flank your Ragnarov to avoid its abilities.

Honestly I find the Marza does better in almost all cases, even if they aren't as good against a single titan, they'll destroy the enemy fleet extremely quickly making killing the titan much easier.

I always view Progens as healing ships first an foremost, Malice is just an extra goodie if you happen to have more antimatter than you need.

The Rapture is fun and can be extremely powerful if you're relying on carriers thanks to its passive, but honestly even mine control isn't all the impressive (especially if your Advent Loyalists, your titan is much better at stealing frigates). I would build more than 1, and even then only if you really like the ship.

No, but you still want a Radiance for detonate antimatter. Like the Dunov for the TEC, it is the only Advent ship that can drain titan antimatter.

Everyone hates the VL titan, but no disagreements here.