Without a doubt, the Celtics.
The 76er's practically gave away their talent last year while receiving less value for the dollar. What will they do with Young ? Hopefully they actually get equal value for him somewhere down the road. Sure, they got lucky with the ping pong balls and landed three talents in Embiid, Noel, and MCW.
I'm personally not that high on MCW, and their prize pieces are damaged goods. They really better hope to hells bells that Noel & Embiid can stay off the trainers table.
The Celtics have more assets, more picks, Rondo, & a better coach. If Ainge hit on Smart or Young, or both, watch out. You're setup to succeed a lot sooner rather than later. It's going to be later regardless for the 76er's unless Embiid and Noel just dominate from the start. I think the only thing they dominate from the start is the electrical tape in the trainer's room.