I tend to use a cruiser and/or carrier heavy fleet.
For frigates, I tend to use Lasher and Wolf (or whatever I can find) early, then Afflictor, Tempest, and Hyperion late in the game. Tempest for enabling pursuit or AI use in small fights, Afflictor or Hyperion as playership.
For destroyers, Medusa or Hammerhead early in the game, maybe Condor too. Late in the game, Drover or bust.
Cruisers are my primary fleet ships, and I use Falcons as grunts, Eagle and Dominator as tanks, and several Heron and/or Mora. As a flagship, I tend to gravitate toward Heron or Eagle with Converted Hangar.
Capitals, either Legion for general-purpose brawling or chaff sweeping, or Paragon if I want to kill just about everyone. If I need a third capital, I possibly bring Astral. (I will bring Astral along if I find it before I find Paragon.) I usually only deploy one and I pilot it.
Generally, high-tech is hit-and-miss. Some hulls are very powerful while others are mediocre by demonstrating energy weapon weakness all too well. Also, high-tech is a royal pain to outfit because none of their energy weapons are on the Open Market (mining laser does not count - too rare and too weak), and Black Markets only have the basics (PD lasers and pulse lasers).
Many of my fleet's ships are low-tech or midline, with few high-tech exceptions.