It works better when you get your undead minions to do the torture for you. They can brutally torture and debase your evildoing victim 24 hours a day while you adventure and gain loot to help you in your quest for good.

Its how my Devotion Paladin prefers to gain information from the evildoers.

Summoned Demons also work, but they need to sleep. On a positive you can go even more good, by feeding the evildoers to the Demon after the information gathering is complete. I prefer to use undead though.