Boston has a connection to the Lakers, in part because he played HS in LA and because he's signed with Klutch Sports. The intrigue with BJ Boston starts with his measurables. He's 6'7" (in shoes), with a 6'11" wingspan. Those are SGA/Shaun Livingston measurables. He's not a high-end athlete, but he has enough athleticism and skill that he should be able to play with some space. He just needs to physically mature. He's had moments where he's looked awful, but he has the potential to be a 3-level scorer and 3D wing. Long term, he can play both on and off the ball.
He's a project, but his ceiling is very high -- like a near-to-Mikal Bridges defender who can do some Brandon Ingram things on offense. Is he worth it to the Jazz to wait on and develop? Not sure. He's a better prospect than Dante Exum, but there are other guards who have high ceilings and higher floors in the Jazz's draft range.
At this point, I'd take Primo over Boston if both were available.