I have an obsession with the Sons of Feanor, even though I despise Celegorm and Caranthir. I love Maglor and I like Maedhros a lot because they are such complex characters-- causing devastation and yet being the least twisted of all the sons. Although, I know fanfiction plays a big part in what I like about certain characters.
Don't get me wrong, Elrond is one of my most favorite characters ever. I love his family-- Elladan, Elrohir, Aragorn, Elrond. Arwen I'm kind of neutral on, which is weird.
I usually only read the fanfiction that suits my image of the character. I like to wonder why Maglor let Elrond and Elros go, why Maedhros would go search for Elured and Elurin... they're just fascinating characters and I find it hard to believe that they are wholly evil.
I don't know what side I'd be on if I had to choose. Elrond and his family have to win above all others, though.