I would prefer picks a few years down the road if making such a trade. In order to have max free agent room, assuming we get a top two pick, we're going to be about Avery Bradley's salary away (if we get #3 or #4, letting Olynyk walk would likely be sufficient). Getting another pick in this draft means salary obligations that again limit our max free agent potential. Furthermore, we already look to be bringing on 3-4 rookie next season (Nets pick, Zizic, and one or both of Yab and Nader). There are only so many minutes to give to rookies while trying to be a contending-level team.
So picks in 2020 or 2021 are the way to go.