by eyedrop on Tue Mar 21, 2017 5:09 am
Proper dialed in frame geometry for your body should always be the first consideration in regards to performance and choosing a bike. Make sure you know your ideal stack and reach, which can be determined by an expert fitter that can fit you on an adjustable stationary bike. Any reasonably light and stiff design will do. Whether its carbon or steel or anything in between is an afterthought IMO...
But supposing all geometries were the same, I would go with a mid level alloy frame with perfect geometry, and get some carbon clinchers with an alloy braking surface and good hubs, such as the Shimano Dura Ace C35 or something.... However, if you only ride on the flats with no heavy braking, a straight up carbon clincher is fine.
As far as the frame goes, a mid level vs. high end frame wont offer a huge advantage. Maybe a little lighter, stiffer, and more aero. But not by a large margin. Go with something mid level that fits like a glove, and go high end on the wheels and tires. And dont forget the good quality bike fitting, proper gearing, and power meter!