I'm still undecided between Bagley or Jackson Jr. On draft day I'll probably look over the table to see what Vivek wants to do.
Bagley vs Jackson:
With Bagley we have the chance to add a #1 scoring option, a potential 25 PPG player. No way Jackson can fill that role. Think how Boogie could go coast-to-coast towards the end of tenure with us. Bagley will do that better and faster than Boogie. He has better body control and less body mass to change directions and zig zag through traffic.
Jackson can shoot the spot up, but he's not going to attack close outs like Bagley who can put the ball on the floor and weave through traffic with the Euro step. Jackson is nice how he can block shots with his left hand and long reach. But he makes 5.9 fouls per 40 minutes compared to Bagley 2.4 fouls per 40 minutes. So for all those shot blocks Jackson is going for he is committing a lot of fouls sending the opponent to the FT line.
WIth Bagley's agility and motor, I anticipate he will become an above average perimeter defender. He will be able to switch out onto wings and guards and rotate back into the paint. He's not going to be the shot blocking presence of Jackson, but he will challenge shots with his quick leaping and positional awareness.
With Jackson's defensive acumen and length, you would expect he would have the higher rebound rate. It wasn't close. Jackson 10.6 rebounds per 40 MPG. Marvin 13.1 rebounds per 40 MPG. Marvin's quick reaction time and relentlessness to go after his own miss and rebound outside his area compensate for his shorter wingspan.
I also think Bagley will be comfortable all over the floor. This is what I like about Doncic, he can run the point and also go into the paint and battle with the bigs. With Bagley I see him as guy you can run offense through high post mid post and low post. Jackson is not this versatile.
Shot blocking is overrated. What is more important is eliminating easy shots at the rim through sturdy presence, crowding the shot attempt to force the miss. This is how a guy like PJ Tucker and Draymond helped their teams to WCF. There is no reason to think a guy like Bagley or Harry Giles for that matter can fill this role. Until we see enough evidence to the contrary, as the case with Willie, I say give the aspirant the benefit of the doubt.
In sum, Bagley outclasses Jackson as an offensive player more than Jackson outclasses Bagley as a defender. I love a guy who can swat a shot into the third row as much as any guy, but choice between the two prospects is not that tough from my perspective.