It really comes down to what you mean by
"pick one". I would agree with people who are arguing Breece is more talented. He was drafted higher - not just in terms of round, 2nd vs. 3rd, but he was the 1st back off the board in this year's draft. Clearly, he was more highly regarded by NFL scouts in an era where RB is not valued nearly as much. Breece has physical gifts (size: 5-8 v. 5-11, 181 v. 217; speed: 4.56 v. 4.39, ) that Troy did not.
However, I voted Troy in this match up.
The reason is because of what Troy's performance meant to ISU and to college football in general.
ISU:
I grew up in Ames and started going to games as a kid during the Walden era. People do not understand how low the program was at that point unless you were there... in the middle of a 15 game skid to our rival, never really coming close to a bowl game. It was brutal. When Mac came to ISU Troy Davis was the shot in the arm the program needed, it was the positive story that Mac needed to sell kids on coming to Ames. Even when the last hope for a bowl game was gone, Troy gave fans something to cheer for, something to celebrate, a reason to keep coming back, a reason to watch ISU football in November. It may seem insignificant to young ISU fans who are getting used to going to bowls every year. But Troy was a positive story that brought fans back to ISU. It took more than Troy for Mac to turn the program around but TD helped in those early years.
National:
Troy was the first player to run for over 2000 yards in two different seasons and did it in 22 games (11 per season). Ron Dane (1996, 1999) and Jonathan Taylor (2018, 2019) did it in 25 games and 27 games. Dane only played 11 games in 1997 and 1998 and only had about 1500 yds in each of those seasons. Troy finished 2nd in the Heisman voting despite playing on a team that was 2-9. Paul Hornung is the only player to win the award while playing for a team with a losing record (ND was 2-8 in 1956). National media that never talked about the Cyclones talked about Troy Davis and he brought a positive national story line to the Cyclones. When you got score updates on games they would also give you updates on how many yards Troy Davis had. I don't think there is much of an argument who the bigger college story was when they were playing. Yes, Breece was more talented. But Troy was the bigger story during his time and left a greater college football legacy. (NOTE: I fully expect Breece to have more impact in the NFL).
At the end of the day, I would argue that Troy was more important to Iowa State than Breece Hall. Not that I don't appreciate Breece - he is the most talented back I ever saw play at ISU. But Troy was the light at the end of a very long tunnel. I don't think many fans that were not in that tunnel will ever really understand or appreciate that.
Combine Numbers for Reference:
NFL Scouting Combine and Pro Day scores, percentiles and metrics for Troy Davis, RB, Iowa State.
nflcombineresults.com
NFL Scouting Combine and Pro Day scores, percentiles and metrics for Breece Hall, RB, Iowa State.
nflcombineresults.com
Heisman Trophy Winners and Team Records for Reference:
How have they figured in Heisman history?
www.heisman.com