The propel is aero so will be faster. It has weird brakes, that might be a downside depending on your uses/preferences. Otherwise both are well designed bikes that work fine.

The stiffness thing is mostly just a feeling, one that can be confounded by components, especially wheels and tires (in other words, a bike might feel stiffer than another merely because of the wheels and tires on it, or the handlebars, or your imagination)

What do you mean by aggressive?

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Kat Hunter reports on the San Dimas Stage Race from inside the GC winning team
Aeroweenie.com -Compendium of Aero Data and Knowledge
Freelance sports & outdoors writer Kathryn Hunter

my more aggressive I meant faster and how one handles turns.

Thanks for your feedback

Quickness comes from front end geometry with trail being the main ingredient. Trail is dependent on HT angle and rake though. A bike with a steeper head tube angle and shorter rake will steer "faster" than a longer and shallower frame.

You can compare frame geometries and see which should be quicker. However, numbers may not be exactly what YOU feel.

Other lesser factors to quick steering are "tiller effect" of the stem length, wheelbase and tires and your position on the bike. This changes center of gravity.

Note that whether a fork has a straight rake or a curved rake will not affect its trail. However most people think a straight rake fork feels more harsh.

Assuming each bike has a stack/reach that let you get in your preferred position, the only thing that will make a bike faster is being more aero or lighter.

As for the turns, both bikes you are considering are road race oriented bikes. To compare cornering, again you have to be careful to use the same wheels and tires, and even then your perception may lie to you.

I've still yet to see a crit race where everyone went through a turn and all the guys on brand-x bikes got gapped or fell over =)

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Kat Hunter reports on the San Dimas Stage Race from inside the GC winning team
Aeroweenie.com -Compendium of Aero Data and Knowledge
Freelance sports & outdoors writer Kathryn Hunter