I'm partial to the '86 Celtics, with Bird at his peak and one of the only two healthy years Bill Walton ever had, as 6th man.
I am not a Celtics fan at all (Pacers fan for 53 years!), but that was beautiful basketball for combining offense (inside and out), defense (inside and out), opportunistic fast breaks, spectacular passing, great shooting efficiency, and just plain clutchness.
The Spurs had many similar characteristics. You could say the Warriors too, though they are more outside-in than having inside-outside balance. Centers and PFs outside of Jokic, Embiid, and Giannis seem to have less of an impact than ever, unless they also play outside-in.