I don't know what the difference is between how they look. What does my trek al2 domane have? Excuse my ignorance.There's road bikes and there's ugly road bikes. Most modern ones with disc brakes and those horrible tumour shaped brifters fall into the latter category. There's probably only two things that @vickster and I would ever both agree on - and that is that matt black bikes look dull and boring and Shimano hydraulic brifters are really pig ugly.
You're barking up the wrong tree anyway if you think buying a much more expensive bike is going to make any meaningful difference to how fast you can go. It really isn't; any such gains are going to be tiny. and will get lost in the normal variables of air density and wind direction on any given ride.