obligatory 'the one that fits'

that aside, 1- bmc, 2- p3, 3- shiv

Yeah, I should have prefaced this post with that. I will definitely go with the one that fits the best, but all three of these are nearly identical in the setup I'm looking for and all are pretty good on adjustability.

If you're looking at the P3 and it's the new one, I'd look at the P2. I think the new 11sp is The Best Bang for the Buck Aero Bike to buy right now.

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Brian Stover USAT LII
Accelerate3 Coaching
Insta

I would pick based on:

1. price
2. color
3. unique features (ie, water bladder, useful to you? under BB brakes? pain in the ass to you?)

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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

Yes, especially if you plan to replace the aerobar anyway.

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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

I agree that the frame on the new P2 is the same as the P3, but the price difference would be negated by me upgrading the stock 105 components & I'm not really digging the P2 cockpit.

Just fyi there would be 0 speed increase by upgrading the 105 components. But yes, the aerobar would need to be swapped to match the p3.

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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

I'd say the P3. Because it's the fastest bike you have listed there, although the speed differences between them are small. The groupset doesn't matter, and blindfolded, using bar-end shifting, you'd not notice a difference between any of them.

Well not necessarily, BMC has said theirs is faster, Cervelo said theirs is faster. BMC is better looking, BMC wins.