I wish we could combine them into one player.
Wall is a significantly better passer and defender.
Kyrie is a significantly better / more efficient scorer and shooter.
Neither seems like a fantastic leader, as each has been a bit prickly with teammates at times.
I see the appeal for acquiring Wall. With scorers like Hayward and Tatum, Kyrie's elite scoring is arguably less important than defense and having more of a facilitator. But, if it's not broke, don't fix it at this point, unless a trade is clearly in our favor.