For what it's worth (from my experience)
I tend to use Terminators as an offensive unit, particularly against low-SR armies like Guard (4 Terminators, 1 Oblit and Daemonic Pact) taking advantage of mistakes that my opponent may have made to roll up whatever high-value target (ideally my opponent's BTS) presents itself. This tactic doesn't work so well against SR4 and 5 armies

but this is why I take Daemons, so that I can put them where they're needed from game to game. But the Daemon Prince never seems worth it here.
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Instead I've been trying one stuffed in a retinue where it makes shifting them/wiping them out damn hard.
I always do this, making it your Supreme Commander too is a good way to protect those re-rolls (if the worst comes to the worst), if you use Daemons giving the formation it's part of Daemonic Pact is worth it too (even if the formation is almost wiped out, a lone Daemon Prince rallying and then summoning Daemons, before engaging at 40-odd cm if you took the winged variety is still a threat most people will throw inordinate amounts of firepower at).
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...and I have always wonderred why Eldar get a free 'Greater Daemon' when chaos does not....
..because they don;t get enough special rules already?
