Cervelo S3 2015 or Giant Propel Advanced Pro 2

Currently I am in the midst of buying a new bike. My choice is between Cervelo S3 & Giant Propel Advanced Pro 2. The criteria I look for in the bike is 1. Speed & 2. Comfort. All comments are welcome.
Thanks in advance
Adam
Thanks in advance
Adam
0
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ABCC Cycling Coach
However you want to really consider a wider pool of aero bikes, including:
- S5
- new Scott Foil
- Canyon aero thingy
- Look (I have the 695 aerolight, which is fab and quite fast enough for me)
- Venge
Depends on budget, heart etc.
Road: 95 Trek 5500 -Look 695 Aerolight eTap - Boardman TTe eTap
Offroad: Pace RC200 - Dawes Kickback 2 tandem - Tricross - Boardman CXR9.8 - Ridley x-fire