I would say the 1983 team that had a HOF in Barry Larkin, a three time AS in Chris Sabo, a pair of guys with long MLB careers in Scott Kamieniecki and Hal Morris, and a fifth guy who had a cup of coffee in the bigs in Gary Wayne.
They went 50-9 (.847), which was better than either national title team, they were just upset by Alabama, and ultimately eliminated by an absolute juggernaut of a Texas team that had 9 future major leaguers on it, including Roger Clemens. Texas has the best winning percentage in the history of college baseball, and 1983's 66 win team was their winningest.
I think that was Michigan's best team, Texas was just really, really damn good that year.