Hmm, totally different trades.
Davis is clearly at a significantly higher level, but he makes big money now, meaning that someone with a big contract has to go too. It will also take a monster haul to get him. He's been amazing, but he hasn't carried a team very far and we don't know if he has championship level competitiveness.
Porzingas still is on his rookie deal and his contract doesn't end until Horford's does, so none of our big contracts has to go. He will command a lot of assets too, but probably not what Davis will. I think our championship chances are better having Horford too, so I'd prefer a cheaper deal for Porzingas.
Porzingas is 22 and Davis is 24. Either way, while Tatum and Brown are great prospects, the C's would easily give them both up for either player.