
This is a very quick summary of what I think of each unit from a gaming perspective. It's by no means in depth and will miss clever tricks. I'm also not going into the Special Characters for now.
HQ
Overlord - Competent HQ choice. Same as before but I2. Phase shifter is way expensive. Command Barge and Warscythe ("Overmissile") seems the obvious choice.
Destroyer Lord - No Invulnerable save is going to hurt him, but you're most likely taking him to keep a Ressurection Orb nearby fast moving units. Does this well and is as close to a combat character as we get.
Royal Court - Lords are a bit meh (they won't save you in CC), but can carry Ressurection Orbs. Crypteks are the stars of the show, with Destruction Crypteks looking like the obvious choice against most opponents.