I think it is Tatum. He just seems much more in the mold of a go to scorer than Jackson. I dont really view either as having elite length. Tatum is decent at 6'11 (compared to just over 6'
, and Jackson is slightly worse at 6'10 (for just under 6'8.) Neither has the kind of length Brown does (6'7, 7'wingspan.) I view Jackson as a potentially slightly better brown, where as Tatum is more of a herky jerky scorer.
Jackson has been picking it up lately, and his open court passing is a good skill, but I could see him having the same developmental worries we have about Brown. We could use a good rebounding SF/PF that can score from basically anywhere. Tatums shot should come around.
Also alot of the scouts I have seen like Tatums defensive potential due to his size and quickness. He wont have the crazy blocks that Jackson gets, but he should be well above average assuming he stays the course.
Basically I believe they are similar levels of prospects, I just see more star potential (aka go to scorer) in Tatum than I do in Jackson.