There's a case to be made for both of these players staying in Dallas next season, but it only makes sense to keep one of them.
Brandon Williams and Ryan Nembhard have both made cases to be on the Dallas Mavericks beyond this season, as both players crawled their way from two-way contracts into standard deals, but the Mavericks will likely only be able to manage to keep one of them after this offseason.
Williams has proven to be one of the best rim attackers from the point guard position in the league, while Nembhard is poised beyond his years as a table-setter.