We're still in a somewhat small sample, but so far, only one team is top 5 in both offense and defense: Toronto (#3 offense, #5 defense)
Milwaukee (#2 ) and Portland (#4 & #10) are top 5 in offense and top 10 in defense.
Denver is #7 in offense and #9 in defense.
Those are the best all-around teams so far.
The Celtics do have the clear cut #1 defense in the league, but their offense is #24.
Memphis and Indiana, also top 5 in defense, are similarly bottom-10 in offense.
OKC has a top 5 defense and an above mid-point offense.
New Orleans is the inverse of Boston, with a top 5 offense weighed down by bottom-10 defense.
Golden State is the top offense but their defense is only 16th so far. I expect that to change.