Without question, aero. Unless you are doing grand tour climbing stages, there is not reason to go for lightweight at the expense of aero. BTW, the bike is not the only piece in the puzzle, a lot of your choices including helmet and clothing (and zipper) play a part, and we are NOT talking about marginal gains.
Listen to some of Robert Chung's podcast, it's very illuminating. The game has changed a lot in the last a few years.
The old conception of aero road bike is they are too stiff and heavy. The recent models of road aero bikes are all moving to disc brakes to create wider tire clearance for lower rolling resistance and comfort. My 2019 Specialized Venge can clear 35c tires easily. I have 28c tubeless tires and riding at 65psi. It's both faster and more comfortable.