Quality - NATO edge. Huge advantage, USSR had a huge espionage program to try to catch up. Attempts to catch up bankrupted the Soviet Union. Personal computer revolution widened the narrow technological gap that existed in the 50s and 60s.
By the 1980s principle US tank M-1 Abrams, German Leopard II, and British Challenger were more than match for Soviet T-72 and T-80. Firepower was roughly equal, however, NATO tanks were more mobile, roomier, and used various laser targetting systems making them far more accurate. Western tanks had a breakthrough in armor - Composite Armor -> absorbed explosions to a certain extent. The average NATO soldier was better trained, higher educated, and was given a higher scope for personal initiative. Soviet soldiers on the otherhand were largely of a peasant underclass, less educated and less training. The Communist system allowed for zero personal initiative.
After the collapse of the USSR, Israelis and Americans found technologies in the USSR that was 20 years ahead of the American.
Ballistic missles such as Voevoda (SS-N-18 Satana) was by far the best Ballistic missle in the world. Also the Sunburn Cruise missle developed in the 80's was better then aby western technology, which the U.S wanted to buy off Yeltsin even in 1995 because they had no defense against it.
Russian and Soviet Tank mechanics have always been the best, even to this day the T-90 is unsurpassable, if anything the U.S had more quantity but the Soviets had much better quality, as for the T-72 used in the Gulf war (since I know it going to come up), the Iraqis used tested rounds, and the Soviets of course sold much inferior tanks to other nations. Also the Defense system surrounding Moscow is the best defense system in the world even to this day.
As for your theory that the average NATO soldier was better trained and educated then in the USSR, you couldnt be more wrong. Russian Physics and Mathematics were by far better educated then in any western nation, Physics material taught in Harvard were being taught in Russian grade school. Personal initiave was also much greater in Russia because the majority of the reserve was voluntery, unlike in NATO where the soldiers were only looking for money and benefits, which was their only initiave.