1 2 Ironman Distance Races

I have my choice between a Cannondale Slice 5:01 Cervelo P2, what should I buy?

I am a competitive triathlete. I compete in Half Ironman Triathlon and racing. I'm looking to make the jump to the next season the full Ironman Distance. So I decided to finally get away from my road bike beginners and buy a TT bike style. But I can not decide between these two bikes. 1) What was the party more aero? 2) What is the best to walk 112 miles? 3) What is the bike is harder?

The Cannondale is stiffer and has always been the main complaint about "vouchers for little boys …. If you're light, they will hit you. If your big guy, rides beautifully. That said, the P2 is the bike a little better, with a solidity and quality that you can not find the 'Dale, but both are excellent nor will blow your mind if you just mounted bike beginners (P2 heads again).

My Half-Ironman Journey