Test ride them, then see which you prefer.
This. If you can’t then look for something you can. If you don’t want to do that then you may as well toss a coin and pick one, or go for the cheapest, or go for the one in the colour you like best!
What are you riding at the moment? How have you narrowed it down to those two?
Edit… if it’s your first road bike then unless you have loads of spare cash just buy something cheap that roughly fits. As you ride it more you’ll learn to know what you like and don’t like. You’ll probably change most of the contact points as your position develops (saddle, stem, bars, etc.) and having ridden it for a while you’ll then have a much better idea of what you like when it comes to buying a new bike and you can then sell the old bike on or keep it as a winter trainer.