This discussion comes up at least once per season and I always respond the same way. For me, and I would assume most people when given historical data, would much prefer the shady side.
That being said, there are times when being on the sunny side is an advantage. But those times are rare and it is hard to argue. Some things need to happen together for the sunny side to be an advantage, and that is rare.
1. It has to be a sunny cold day. (How many games are under cloudy sky after mid October?)
2. It has to be an 11:00 AM kickoff (by November, even 2:30 kickoff games are played under dark sky after half time, and the sun angle leaves little sun warmth after 3:00 PM).
If you are stuck in the shade on a cold day you can still use and/foot warmers to even things.
Meanwhile, to get benefit from the shady side, all you need is a day like last Saturday, and we get a Gopher Gameday like that almost every year. Sometimes multiple games like that.
I think of this debate every time I have a text exchange like this one, with my sister in law on Saturday:
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