I think this is very interesting question, which game, outer worlds or the cp, will be better. They can be both great or even masterpieces, but one can be more enjoyable for some, the other for others for different reasons.
I think CP can be better overall, more even due to the bigger budget. Hopefully cp will improve in the areas in which the Witcher was weaker, keeping all the best stuff. This would be a bar set quite high.
But the outer worlds is a game I really wanted to do well and be great to play. It seemed... To have character. To be made with passion, despite some limitations. So I can't wait to play it, despite that it looks ugly to me.
I guess I hope both games will be great and people can enjoy two masterpiece rpgs in 2019/2020...