I'm torn with Mitchell. I certainly hope he'll be a Knick a long, long time. He's everything Ewing was expected to be out of college - a real defensive stalwart. Of course, Ewing surprised all by teaching the world that centers can shoot too, and in a way, helped pave the way for big men down the road.
He has the best value contract in the NBA - in that sense, he's an even better trade commodity than the #1 overall pick - Zion over the next 3 seasons will earn in the neighborhood of $27m to Robinson's $5m.
Now compare that to AD's 2019-2020 salary of $27m by itself vs Robinson's ~$1.6m. That's $25+m of salary that could be distributed across a bunch of role players.
It's an interesting question for the Knicks. I mean, if all is true with Durant and Kyrie coming to the Knicks, is Robinson an ideal complementary player for them - he sucks in the defense to protect against lobs; he doesn't demand a lot of touches - a good thing with 2 ball dominant players. AD, for all his talents (he's a legit #1 scorer and strong distributor) needs the ball in his hands to maximize his value. Much like with guys like Kevin Love and Chris Bosh, when playing on championship level squads with 3 stars, someone has to defer. Wouldn't it be ironic to merely see AD playing a Mitchell Robinson-like role (or Al Horford-type role) rather that showing his full skill set?
From a straight up comparison standpoint, Robinson does appear to do a few things better than AD - run the floor, block shots on the perimeter, and finish (and that's even considering AD as elite at those same things as well). Mitch is a legit DPOTY candidate moving forward - a bit of a young Dwight Howard on D and emerging on offense.
On the flip side of the argument, acquiring Anthony Davis gives you elite talent to spare. If Durant or Kyrie miss some games, Davis would have the capacity to step. Robinson may have more to his game, but the Knicks haven't unleashed it - it'd be hard to count on him as a go-to player at this phase of his development.
In addition, Davis is only 26. He's still a pretty young player - just entering the prime of his career. He'll be able to keep going and be the face of the franchise when Durant moves to the next phase of his career.