I trust Tommy's opinion.
I go back to the tail end of the Russell era, but believe it or not folks, very few of the games were televised back then, so we're not as familiar with those teams.
But, as far as the 86 team versus the current team? I honestly don't have an opinion because the rules and the officiating are much different. I suppose the 86 team had more overall talent, but IMO this team is more fun to watch. The style was more one-on-one and post-up back then, the NBA was pretty boring(just think of Charles Barkley with the ball backing his man down with his big fat behind, and four teammates standing around, to remember how boring basketball can be).
But the topic is fun, just to remember how many great teams and players we've been privileged to watch here.
PS- the Cowens era teams were no slouches either.