The few times that I have watched Leipzig this season (for occasional betting purposes, lol), Ibrahima Konaté has been much better. Younger too and more physically imposing. Seems quicker too. Better WhoScored ratings as well. Probably the much cheaper option as he is lesser known and not as hyped as Upamecano.
Anyway he would not be the worst choice out there but I can certainly think of better and likely cheaper options. His teammate, Konaté being one of them.
I have no doubt in my mind that Ibrahima Konaté, provided that he does not suffer from a serious injury or turns out to be completely irresponsible outside of the football field, will be playing for an absolute top club and be rated as one of the best defenders in the world. He has every skill in his toolbox to succeed. Rest will be mental.