Help me choose

Help me choose

I am torn between these two bikes.
Look 765 optimum and cannondale SuperSix.
Both have 105di2 and decent carbon wheels. Tyre clearance is more than enough at 30mil.
The thing is, I can test ride the cannondale, but not the look.
I know the geometry is a bit more relaxed than the cannondale and the frame is not as stiff. That’s what worries me. I am a bigger guy at 108kg and a stiffer frame would be better I think. I no longer race due to injuries (crash related). Previous bike was a dogma f10 in 56. Has anyone ridden the look? How does it feel? Lively, dull, …
Price is exactly the same and both are with warranty on my name.
If I had to pick on looks, it would be the cannondale for me. Just looking for opinions and things to consider.
Thank you!