My brig is getting kind of full and I'd like to do something useful with all the prisoners I have.
Any Dominion prisoners get sent off on the Dom exchange and I get back a nice blue DOFF in return. However I have all these Klingons, Orions, Nausicans and a few Gorn that I can't do much with. The prisoner exchange missions have a decent cooldown on them and they aren't a guarantee, since with the exception of the Klingons they all have 1 or more failure/disaster traits. Am I missing any missions here b/c I'd rather not drop them off with the security kitty since the rewards are pretty awful.
Negotiate Prisoner Exchange is the only worthwhile Fed assignment that uses them. Even that's not exactly great. It usually just gives a green doff.
My advice: don't stock up white prisoners. You can get them by accident from Strike Against Fugitive Support Network, and you might as well use them when you do, but you shouldn't be intentionally trying to get any. They're just not worth it as things are now.
Feds really need some decent rewards for prisoners. Ironic, isn't it, that Starfleet is supposed to be the peaceful, "set phasers on stun" -faction, but it's the Klingons who encourage taking and turning in prisoners.
Prisoners count as civilians so you can dump them on the Paradans, Cardassians, etc. in the DOFF missions that eat five civvie doffs and spit out some dil, a respectable amount of Recruitment CXP, and the normal amount of experience. Of course you have to complete at least one of the Consular/Embassy DOFF chains in Cardassian Space before those missions start appearing (and they only appear in Cardie space).