I Love them both.
Every generation has changes that people like or dislike.
The C6 is more refined than the C5. The C6 has the latest technology advancements, more power, more options, exactly what you want and expect in a newer car.
I think it would be hard to call one model better than the other.
I love the styling of the C5, The fat Butt, the pop up head lights, everything about the car other than the seats. My C4 seats seemed allot better than the seats in the C5.
In a couple of years or sooner I will move to a C6.
I think the C6 looks like it's going 150 mph standing still.
I work in a never ending / changing fast paced technology atmosphere.
So this draws me to newest, latest, more advanced items weather it be a Car, TV, or whatever.
I also think and hope that the C5 will be worth more money on resale before the C7 comes along, since it will still be only one generation apart.
This is part of my planning when switching Vettes or Bikes. This way I can keep the net dollar difference to a minimum.
I know one thing. These things are made to be driven & I love to drive my Vette, regardless of the generation.