Watson is somewhat reminiscent to me of Brandon Clarke. He'll come into the league a full year older than Clarke.
They measured the same height, but Watson (7') has 4 inches on Clarke's wingspan (6'8"). Watson also has almost 30 pounds on Clarke when they were drafted. Watson also Clarke's verticals were significantly more than Watson (8", but some of that may have been due to training).
Watson showed more passing/playmaking than Clarke, as well as more shooting, but they both played a similar role in the Gonzaga system, playing next to very similar players in Tillie and Timme. Clarke's probably a better/more electric finisher, but Watson showed more ball-handling and outside abilities.