For the most part i've noticed TEC on normal difficulty builds primarily Cap Ships, Cobalt Light Frigates and Siege Frigates, with the occasional LRM. I am not sure if this is due to the difficulty level or a bug in the AI, but I would assume that since Normal difficulty is supposed to be fairly easy, the game limits the AI to certain ship types making it easier to counter.
I have noticed that Vasari on Normal Difficulty builds primarily LRF Assailants and very few Medium Assault Skirmishers, almost the opposite of TEC on normal. Either way, Normal Difficulty seems to allow for very few if any Cruisers. Not sure if this is intended or not.