OK... this one's hard to pick... back when they were a group, I could very easily say that "Scary Spice" was my favorite (Melanie B.); she had the most attitude and you always noticed her.
After the group went on hiatus, it's hard because I love ALL of their solo stuff... well, Melanie B's the least... but there are some songs on the first CD that are pretty good.
Overall as a solo artist, I'd have to go with Geri as well; I finally sat down to listen to her "Scream If You Wanna Go Faster" CD and was pleasantly surprised at another great pop album (her first being "Schizophonic").
Yes, Victoria does look a bit... well, VERY skeletal lately, but we can't bag on her too much... without her, we wouldn't have the girls... and her album was REALLY good... it's actually one of my favorite's from their solo careers.
Emma has always been Emma and I'll always love her.
Melanie C.... eh, I don't hate her and yes, she is still the one that has a consistent release of albums and hits, but she's not my favorite... but she is the most talented and has one of the most original voices in music today.
Either way or, I still love all of the girls regardless... they remind me of a happy time in my life and I'll always consider myself a fan.
(Amirza, did you start this poll because of me? LOL)