I like the solstice myself. Neither of the two cars have much going for them power-wise but they are nice looking cars. I think they're both sexy, I know from first hand experience with the solstice (lots of gaping mouths) and I have yet to see the sky in person but it looks very promising. I think the solstice is slightly lighter than the sky but has a pretty impractical interior, I hope the sky would have more spots inside for carrying miscellaneous items.
Mallet is doing big things with the solstice as well and there should be a performance version being released someday.