As much as i'd say Utah, which would be a very close second, I'd have to go with New Orleans.

Since the trade demand from their alpha, they turned the situation into this scenario:

Lost:
Wesley Johnson
Nikola Mirotic
Tim Frazier
Alen Smailagic (draft)
Stanley Johnson (came in trade with Bucks then lost as UFA)
Elfrid Payton (UFA)
Julius Randle (UFA)
Jordan Crawford (UFA)
Solomon Hill (big $ contract)
2021 2nd round draft pick (Warriors) - traded to Utah for Favors
2023 conditional 2nd round draft pick - traded to ATL
2023 2nd round draft pick (Warriors) - traded to Utah for Favors

Gained:
Lonzo Ball
Brandon Ingram
Josh Hart
Derrick Favors (trade)
JJ Redick - pending FA signing
Zion Williamson (draft)
Jaxson Hayes (draft)
Nickeil Alexander-Walker (draft)
Didi Louzada (draft)
Christian Wood (claimed off waivers from Bucks)
$3.1 MM Traded Player Exception (Mirotic)
2019 conditional 1st round pick (Cavs through Atlanta) - now moved to 2020
2019 conditional 2nd round draft pick (Nuggets through Milwaukee)
2020 2nd round draft pick (Bucks)
2020 2nd round draft pick (Wizards through Milwaukee)
2021 conditional 1st round draft pick (Lakers)
2021 2nd round draft pick (Wizards through Milwaukee)
2023 1st round draft pick SWAP (Lakers)
2023 2nd round draft pick (Wizards)
2024 or 2025 1st round draft pick (Lakers) - NOP gets to choose which year they want

That is quite the haul for team who was beholden to trading away its superstar with little leverage