I like to lol... intimidate more even though my character is a good guy
Like when i first went to riften (SPOILER:P) The guard trys to extort money from me... and i go something like "thats a bad idea" XD or like when some somebody ask to help them out and they ask who i am i say "I am the best" XD
I feel like acting like a badass is way more fun XD though sometimes i have to Persuade:( but only to the nice people XD... but im Intimidating to the mean bandits who want to rob me XD (THEY ALL DIED IN A HAIL OF ARROWS IN THE FACIAL AREA D:)

Dunmer will switch back and forth depending on how I think he would feel about the situation; my Breton thief used it on a couple of NPCs because her Persuade wouldn't work on them! My mage, however, knows perfectly well he isn't intimidating (unless wearing Flame Cloak or something).