The only difference is the color. Here are both Voyager Starscream figures and Thundercracker. Original Starscream G1 Style Starscream Thundercracker
I don't know if I want starscream or thundercracker, I really wished they made skywarp instead of thundercracker though.
They do, or at least G1 SS does from what I have seen. I have not seen TC yet, but the pics look like the same head as G1 (not Movie SS).
I've got a Thundercracker. Picked it up today at my local Wal-Mart. Both Thundercracker and the G1 Starscream redeco have a new head sculpt. Other than that, it's just the colors.
I really like this character. I bought the movie starscream repaint and was worried about it and havent been able to get into it, but having it in my hands and transforming it, its a mean figure... I really like it more than any of the other movie characters (cant say that about prime cause i havent gotten him yet... damn back order...)