Best record teams don't always win.
2022-2023: Best NBA records MIL 58 wins, BOS 57 wins
Champ Denver (4th best record)
2021-2022: PHO 64 wins, MEM 56, MIA 53
Champs: GS (T 3rd best record)
2020-2021: UT 52, PHO 51, PHI 49, BRO 48, DEV & LAC 47
Champs: MIL (7th best record)
'19-'20 LAL (3rd best record)
'18-'19 TOR (2nd best)
'17-'18 GS (3rd)
Last best record champ in the NBA: 2016-2017 Golden State
NHL:
'22-'23: Best BOS 135 pts, CAR 113, NJ 112, TOR & Vegas 111
Champ: Vegas
'21-'22: COL (2nd)
'20-'21: TB (T7th)
'19-'20: TB (T3rd)
'18-'19: STL (T9th w 3 teams)
'17-'18: WSH (T6th)
'16-'17: PIT (2nd)
'15-16: PIT (3rd)
'14-'15: CHI(7th)
I'm not sure when the best record NHL team last won the championship.