I contend that the Bulls were the best defensive team of the 90s, with an alpha male scoring franchise player.
Here's the alternate reality... the b-ball version of The Twilight Zone.
It's the summer of 1991, Michael Jordan just won his first championship. Coach Riley plans to join the Knicks and make 'em the best defensive team, at par with the Bull's defenses, if not a tad better.
Something strange happens... Patrick Ewing finds himself in Houston and Hakeem Olajuwon finds himself in New York City.

Everyone checks the rosters and it's confirmed, Olajawon plays for the Knicks and Ewing plays for the Rockets.
Riley starts his boot camps. He realizes something... Olajuwon is already the best defensive (& offensive) player so that the camp is really for McDaniels, Oakley, Starks, Mason, Jackson, and the boys to pick up the pace.
Then, throughout the year, you hear that announcer say. " {Starks, Jackson, Oakley} misses. Wait! Tipped in by Olajuwon", again and again. Suddenly, you see it, a great defensive team forms with a killer offense. The ball finds it's way to Hakeem, he draws help defense, then when a third defender comes around, Hakeem finds the closest open man to the basket, bullets the ball, and re-positions himself to grab the offensive rebound if it's a miss.
The results ... Cartwright is flummoxed in every way. Even with Grant and Pippen shoring up his sides, he can't do squat about the Shake 'n Bake dream moves. Then, with Hakeem, Oakley, Mason, and McDaniels clamping down the Bull's frontline, Jordan is asked to carry the squad, game after game. Sure, Michael puts up 35, 42, 43, 30, 51, 33 points but it's over in 6. Knicks advance to the ECF and then to the NBA finals, winning their first title since the Walt Frazier/Willis Reed era.
Then, the following year, similar circumstances ensue. The Bulls are beaten in 5 or 6. The Hakeem Knicks era begins. From '92 to '98, for seven straight seasons, the Knicks dominate the finals. Finally, after numerous personnel changes, etc, the Bulls finally beat the Knicks in '99, as Hakeem's legs fail him and he plays limited minutes for the season and retires at the end with 7 rings.