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Not sure where to start with that but aero differences are mainly between riders and positions than between bikes. But there is a trade off between aero and weight for frames, because you need more material to make tubes in aero shapes.
It also makes them stiffer hence less comfortable for general riding.
So you can certainly have a bike that is nicer to ride but will inevitably be slower on a TT if that's what you want.
frank9755
Was thinking, if the aerodynamic differences are so small between the main manufacturers, is the weight difference also very small? I am thinking about a switch to discs and for riding hilly courses if aero is equal/too subjective to measure then a reasonable weight saving would make riding the bike year round more fun.