Azura.
All the Princes are cold, calculating, scheming, egomaniacs. But instead of treating mortals like cattle, Azura treats them more like pets. She seems to have a genuine (if passing) interest in our well-being. She aids the ones she likes, just don't bite the hand that feeds and you won't find yourself cursed.
I'd rather be a pet than livestock.
Boethea, Mehrunes Dagon and Shegorath are right out the window. I'm not so blind as to follow someone that's as likely to kill me as to reward me. Each one of them finds too much joy in killing their followers, it's their favorite pass-time.
Sheogorath, especially. Never know if he'll kiss you, weep on your shoulder or banish you to 50,000 feet in the air to fall to your death!