He is long AF which is probably his best trait over the other wing prospects. I dont think any of the wings in the draft are particularly long maybe outside of Knecht (maybe Holland but his shoulders are so incredibly narrow it makes his wingspan look small to my eye-test).
I do think that the wing trio (Holland/Buzelis/Williams) is constantly changing my mind. I'm not particularly a fan of any of them, but I can see all 3 panning out. Holland has the explosive athleticism, Buzelis has the offensive craft/fluidity, and Williams has the length/downhill ability. I'm not sure who is more athletic between Williams/Buzelis. I would probably give Buzelis the edge.
I think I just lean Williams being the worst of the 3 due to his lack of tenacity and complete lack of off the dribble shooting. I know shooting can be taught, but off the dribble game is a tougher thing to teach especially when you arent showing any signs of attempting them.