Armand was made by Marius. A 4,000 ancient.... That makes Armand leagues stronger than most vampires walking the earth. Marius only made Armand to fight some vampire assassins who were coming for Akasha blood while Marius escaped with Akasha and Enkhil statues.
However Lestat was made by Magnus who was pretty fuckin old as well, but I don't think he was much more than 1,000 years... Which makes Lestat stronger than most, but not Armand.
However after Lestat left the theater, Marius comes to Lestat, Lestat drinks from Marius quite a few times.... Which puts him on par with.Armand, but then Akasha called to Lestat, and he drank from her which placed him way above Armand...and pretty close to Marius, so Marius took Akasha away and abandoned Lestat. Which sent Lestat into the depression that led him to New Orleans.
So by time Lestat and Armand meet again..
Lestat will be much stronger than Armand.. Not sure how accurate this is for the show... But Lestat demonstrated several of the powers that Armand showed in this episode that Lestat used in the first season.