Favorite playable race: That's a tough one. I have played several races, all of the core ones of course, my top non-standard races are Dark Elf, Deep Gnome, Tiefling, Muls, and Blood Sea Minotaurs. (Come on, who doesn't like Kaz the minotaur, he stole the show from Huma, in my opinion)
But honestly, most of my memorable characters and even the majority of characters are Human. My main character in every MMO is the Harvester of Souls, Jaccob Sorrow, who is Human. Which I stole from Eric. So I guess my favorite playable race would have to be Human.