Flat bar TT
The Trek’s riding position is a tad more upright so if you’re wanting to get hunkered down for a TT then one of the others might suit better. The Specialized has a 4-position adjustable stem (via an asymmetric shim thing) which might be good for getting your tuck right. Otherwise, I’d budget to fit a proper adjustable stem and some tribars if you’re going racing. Even if you’re not (too) serious, the amount of time it’ll save you makes it worth the effort…