This one is impossible to answer.
In the late '70s Chris Campbell was amazing, and senior-year Bruce Kinseth was extremely fun to watch. Then early '80s had Ed Banach, Randy Lewis, Barry Davis and more. Jim Zalesky had some of the most exciting matches ever. Later in the '80s there were SO many fun ones, Royce Alger and Rico Chiapperelli being two that have to be mentioned. The Early '90s were even more exciting, with Chad Zaputil, the Brands and Steiner brothers, Mark Reiland, and Bart Chelsvig. That led into two of the best in Lincoln McIlravy and Joe Williams, not to mention Mike Mena Jeff McGinness, Mark Ironside Jessie Whitmer, and Lee Fullhart. Back up a hair to John Oostendorp, who would have been a 4-timer if college had a 230-pound class. After them came Jody Strittmatter and Eric Juergens and TJ Williams. A few years later came Brent Metcalf and Matt McDonough, Mark Perry, Montell Marion, Then Tony Ramos, Thomas Gilman, Cory Clark, Sammy Brooks, and Brandon Sorensen. Most Recently Spencer Lee, Austin Desanto, Alex Marianelli and Michael Kemerer.
This list leaves off so many great wrestlers.
I could make a top-ten list, but it would be very difficult and would leave off some very deserving wrestlers.