>>512470612
Eugenics is a retarded idea in the first place, but if you have to do it, it would be IQ, obviously.
Literally everything we have was invented from nothing by the intelligence and ingenuity of billions of people. To prioritize looks because it makes your dick hard is retarded and dysgenic. The human body already has enough useless, mate attracting features.

It's double retarded when you consider that gene editing is a realistic near future technology that will almost certainly be human viable within the next 100 years.
If you want muh blonde hair or uber aryan hyperborean jawling or whatever, that's really easy to do. You want to make someone super smart? Well that's a LOT harder.