1973 Arab-Israeli War of 1973. Which was the superior tank on the Golan Heights battlefield? T-62 main gun was a 115mm smoothbore vs the Centurians' 105 rifled. A vastly outnumbered Israeli tank force, made-up of mostly reservists kicked-hell out of an enemy force which by sheer weight alone should have captured the heights.
I don't think it was the quality of the tanks which tipped the scales, the outcome would probably have been much the same if the Israelis had T-62s and the Syrians Centurions. The Israelis had positioned them in a way giving them the tactical advantage. Reservist or not, the Israelis were better prepared. And a lot of the Syrian tankers panicked and hundreds of T-62s were left by their crews on the battlefield more or less unharmed.