Giant TCR Advance vs Cannondale Super6 Hi Mod

[Work iT]

HI

 

I currently own a 2006 Giant TCR Carbon Comp and I was quite satisfied with this frame and brand. 

However,I'm in the market to buy a new carbon road frame and looking for some advice on the following.

 

I've identified a couple of frames:

 

Specialized Tarmac SL3, Cannondale Super 6 Hi Mod OR the Giant TCR Advance SL. 

I would like to know strengths and weaknesses of the above or just some guidence on which 1 to go with...