Tracy McGrady says the Boston Celtics will win the 2019 NBA Finals with Kyrie Irving leading the way. (1:17)

McGrady: Celtics will win it all in 2019 (1:17)

Both the Boston Celtics and Philadelphia 76ers built their rosters from the ground up, but which franchise is on the better path to sustained success? And which has the better young core?

ESPN NBA experts Jackie MacMullan and Brian Windhorst discuss both teams' journeys to Finals-contender status.

Editor's note: This conversation has been edited for length and clarity.