C.C. is and always will be my favorite character in Geass (alongside Lelouch, of course). For a short time in the beginning of R1, Kallen was ahead of her in the polls, but after episode 11 or so, C.C. skyrocketed to the top and stayed there. Fans may be fickle, but C.C. has a really devoted fanbase that'll stay with her until it's her time to shine in R2 (which, considering the episode summaries from the magazines, will possibly be in a few episodes)
Really though, I think C.C. is far more interesting than Kallen. Dunno, with Kallen...I felt like I've seen her character done before. But it's one of the first times I've seen a character like C.C., and everything she does is just intriguing. It's not like I hate Kallen. She'd be a lot more enjoyable if it wasn't for FANSERVICE (I have the same gripe about C.C., actually, but I don't think hers in comparison is that bad), but I just don't find her all that interesting compared to C.C..
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Really though, I think C.C. is far more interesting than Kallen. Dunno, with Kallen...I felt like I've seen her character done before. But it's one of the first times I've seen a character like C.C., and everything she does is just intriguing. It's not like I hate Kallen. She'd be a lot more enjoyable if it wasn't for FANSERVICE (I have the same gripe about C.C., actually, but I don't think hers in comparison is that bad), but I just don't find her all that interesting compared to C.C..