My favorite used to be Bretons as well, but after playing Henson's Sun Priest and learning more about their lore, Redguards have become my favorite. Helps that I like warriors over mages and thieves.
As for subrace, I haven't really done a Vampire build (I plan to do one soon based off of Doc PGB's Knight of Traitorous Arms). I prefer mortal to Werewolf though since I usually buff up my characters to become living gods, so Beast Form isn't really useful to me
Altmer, because they are superior in every aspect) Lol)) Actually, I like them because of their culture and history and because they are the most magical. If I'd live on Nirn I'd definitely be an Altmer)
Also I like Dunmer, they are kinda Altmer on the dark side)
And Khajiit because they are cute and I love the way they talk)