If we make a trade, it has to be a clear upgrade over anyone we have. Doesnt make sense to bring in one more guy who can "compete for starting role". We got more than enough competition between Dunn, Sexton, THT and George.
Assuming we dont make moves:
If we aim to give OKC as bad of a pick as possible we are probably best off running with Dunn, simply because of his defense and playmaking. Sexton isnt the passer or defender Dunn is while THT is prone to erratic and chaotic play. Both THT and Sexton are better shot creators and better pure scorers than Dunn, but not by that much that it offsets the other things Dunn does well.