Usually its Eliza because she's simply one of the coolest human beings alive, a big plus is she's very nice to look at. *sigh*
I just think Faith is a great character- a bad girl anti-hero rebel type that actually works and hasn't gotten boring/predictable yet. Her character went through some big stuff and is still changing/growing even now. Shes one of the few characterts who's consistently getting better these days.
I also like Angel/Faith because, to me, they're truly the best slayer/vampire combo- the most interesting, the most equal. There's deep love there but not romance, there's real trust, true friendship, respect and eqality. They argue and disagree but get each other- I like that about the pairing.
Also occassional Fuffy because...their the best slayer/slayer combo out there- or maybe just the best combo. 😀