I'd probably take Porter if he's there. If Porter is gone and Young is there I'd probably do the trade. Fred could maybe finally have Miles Bridges on his team then. What would you do?
I'd have to think long and hard about it, but I'd probably stay put and take Young or Porter. But I don't know what the Bulls are doing. Fred has two years left on that contract so at some point fairly soon he does have to show some sort of progress, and the quickest way to do that would be to add a solid starter or sixth man in Harris and a couple ready made contributors like Bridges and maybe Knox if he slips out of the top ten. But if management is committed to staying the course and being patient all the way through a rebuild then swing for the fences and hope you're getting the next Steph Curry or the next Kevin Durant in one of those guys.
I would also be careful about trading with the Clippers. If Jerry West wants to make a deal to move up then it's probably because he knows something you don't.