Cleveland might make more sense since they clearly want to win now. They really might do #17 and Sully for their pick. However, look at this:
Wiggins
Embiid
Parker
Exum
Randle
Vonleh
Gordon
Smart
There are 7 clear studs, who granted might not all pan out, but on the right team should be successful. If we got Dario Saric I could be interested, but I'm not sure if I want to trade Sully for Doug McDermott. Maybe that statement bites me in the ass in a few years, but I really doubt it. I am not really a fan of Sully, too.
The people projected to go around 17 include James Young, TJ Warren, Kyle Anderson and Zach LaVine, plus someone like Gary Harris could absolutely fall to us there. It's not really that much of a downgrade. The 7th pick is worth about 10x more than the 9th pick this year.