Both are players that you mostly ride when they are getting minutes, Poku has a higher upside, and with OKC likely to want to lose games they have reason to like in the previous seasons give him some extra run down the line. At the moment I think both are mostly streamers, and you should use them as such, I think Poku will be the better asset of the two later this season but it should take a while until he gets consistent minutes.

Right at this moment I trust JRE more.