I will stipulate that to Milwaukee, Giannis had a bigger impact. To Wisconsin, it is Favre hands down. You need to remove your anti-Packer/anti-Favre bias to see it. Wisconsin is about the Packers first, Brewers second and Bucks are a distant third.
You forget that the Packers were struggling in GB and playing a few games in Milwaukee every year. There were discussions about them moving to Milwaukee permanently or worse. But then all of that reversed. It wasn't just because of Favre, but he became the figure head of it. But people tend to forget those days...
Though Roger's 25-6 record against the Bears does trump Favre's record of 22-10. Either one of those is enough to win the state though! 😂
Reggie's impact was legitimizing GB as a free agent destination. Maybe not as big, but as a personality overall, I'd go with Reggie.
I had the opinion of letting Favre stay until he retired... but then he waffled...and hemmed and hawed. Retired and then didn't. It became time to go.
Rogers did likewise. Skipping OTAs and telling the team to have the WRs ready for him? Bah... egos just get too big.
Enter Giannis. I love the guy, but there was just too much smoke to ignore the rumors. The ego grew too big, he stopped being a team player, interfered with coach hiring decisions... blah. No thanks.
The only difference between Giannis leaving and Favre/Rodgers is that there are no succession plan and no hope of getting one in the future because they bet the farm on Giannis when he was here.
I'm sad that 2020-22 Giannis is gone, but I'm happy that 2025 Giannis is gone. If you took a poll, I'd guess you'd find that opinion more often than note.