Howthe is right, VL have the strongest lvl 6 titan bar none. Nothing like jumping into a gravity well, microjumping across said gravity well and munching 60 carriers in a few seconds. I lost my one online game to a semi competent noob because he knew how to use a lvl 6 vorastra properly.
I had a 3:1 fleet advantage, with about an equal economy. this advantage over time got worn down and the vorastra becomes almost unkillable with all that vasari armor and quick microjumps to safety.
My excuse was that the semi competent noob opponent happened to be my target #5 in a 6 person ffa, he attacked one human turned AI while I took out 4 players... So he was actually able to farm XP on the other side of the map all the time I was crushing people.
Pro tip, never let the vorastra get to lvl 6, ever. Xp Starving is your best bet, followed by some sort of jump inhibition and bombers. Its a tough customer!