Which ever one you like to play the most, even if it is not standard.
For the standard races I like Human & Half-orc the best; for the non-standard I like Ogre Mage (Oni) the best, however I've yet to play one. I also really like Lizardmen but that is largely do to the first rpg character I had was a lizard man. I was 10 at the time & that's the only lizardman I've ever played but I'm looking forward to playing one again. Beside that I also like to play Fey characters who are a bit dark, twilight court.