Mikasa is my favourite character, Levi is a 50/50 for me.

Levi has way more depth to him. All that happened to Mikasa was she watched her parents die and then got kidnapped for a few hours. Levi was born in the slums, had to steal food and become a criminal, was forced to join the military and watch all of his friends die, and then put up an emotionless facade to convince his underlings that he's a strong leader (he did it all for their sake and I love him for that)

^ I guess Mikasa's "lack of depth" may be because Levi has a bunch of fan girls who built up his popularity, contributing to Isayama giving him his own series? Without his spinoff, he'd be just as depthless as you think Mikasa is . . .

By far. I don't care for Levi.

^Also, basically what Krillin said.

Levi deserves all the popularity he have, I mean come on that dude is gorgeous, hot, and sexy, and intelligent, strong, leader alike, compassionate, understanding, cool, and...(Imma stop now this could go on forever)
Just one word to describe him, He's LEVI.

Tbh they're my two least favorites.

Levi is sooo cool and cute!